Have you ever struggled to describe feeling unwell without repeating the same words? 20 Idioms for Sick With Real Examples introduces expressive phrases that make conversations about illness, discomfort, and recovery more natural. Instead of relying only on literal English usage, idioms add emotion, personality, and context to everyday communication. You’ll discover phrases that can describe being slightly unwell, feeling completely exhausted, or recovering after an illness. Each expression is explained in clear language, so you can understand its figurative meaning and use it confidently.
These idioms can also help you communicate naturally in different situations, from casual conversations to business communication and formal writing. The examples show how context affects grammar, tone, and meaning. You’ll also learn when an expression sounds conversational, humorous, serious, or too informal for professional settings. This makes the guide useful for learners who want more accurate and flexible English usage without memorizing complicated rules.
Whether you are writing messages, discussing health-related situations, or practicing everyday English, this guide keeps learning practical. The examples connect idiomatic language with real communication rather than isolated definitions. While scheduling, meetings, calendar planning, online booking, broadcasting, time management, and project management may require precise language, everyday conversations often benefit from expressions that sound human and natural. Explore these 20 idioms to strengthen your vocabulary, improve consistency, and express the experience of being sick with greater clarity.
What Is an Idiom?
An idiom is a phrase whose meaning is different from the literal meaning of the individual words.
For example, “break the ice” does not usually mean breaking actual ice. It means to make people feel more comfortable in a new or awkward situation.
Another example is “hit the books,” which means to study seriously rather than physically hitting books.
Idioms are a form of figurative language. Instead of stating an idea directly, they use familiar images, comparisons, or symbolic language to communicate meaning.
Why Use Idioms for Sick?
Talking about illness can sometimes sound repetitive if you always use words such as sick, ill, or unwell. Idiomatic expressions give you more ways to communicate how someone feels and how serious the situation is.
For example, “I feel a little under the weather” sounds different from “I am laid low with the flu.” The first is mild and casual, while the second suggests a more significant illness.
These expressions can help you:
- Express physical feelings without repeating the same words.
- Describe nausea, weakness, tiredness, or general discomfort.
- Make stories and personal writing more vivid.
- Add personality to everyday conversations.
- Communicate degrees of illness more naturally.
- Understand native English speakers when they use figurative language.
Quick List of 20 Idioms
- Under the weather
- Sick as a dog
- Green around the gills
- Off color
- Come down with something
- Down with something
- Laid low
- Feeling rough
- Feeling poorly
- Not feeling oneself
- Out of sorts
- Run down
- A bit peaky
- As sick as a parrot
- Turn one’s stomach
- Make one’s stomach turn
- Have a weak stomach
- Back on one’s feet
- On the mend
- Up and about
Under the weather
Read more:20 Idioms for Leaving With Real Examples
Meaning
“Under the weather” means feeling slightly sick, unwell, or physically below your normal condition. It is one of the most natural casual expressions for saying that you are not feeling well.
In a Sentence
I stayed home from work because I was feeling under the weather.
Other Ways to Say It
- Feeling unwell
- Not feeling well
- A little sick
- Feeling off
Explanation
The expression creates an image of someone being affected by unpleasant weather and feeling less energetic because of it. It usually suggests a mild illness rather than a serious medical condition.
It works particularly well when you want to mention sickness without making the situation sound dramatic.
Best Use
Best for everyday conversations, messages, informal writing, and storytelling. It is friendly and conversational rather than highly formal.
Sick as a Dog
Meaning
“Sick as a dog” is an informal expression meaning very sick or suffering from strong nausea or illness.
In a Sentence
After eating something that had gone bad, he was sick as a dog all night.
Other Ways to Say It
- Very ill
- Extremely sick
- Feeling terribly unwell
- Completely knocked out by illness
Explanation
This expression uses an animal comparison to emphasize the intensity of someone’s sickness. It is much stronger than simply saying you feel a little unwell.
Because it is quite vivid and informal, it can sound dramatic or humorous depending on the situation.
Best Use
It fits casual conversations, personal stories, and informal storytelling. Avoid it in formal medical or professional writing.
Green Around the Gills
Meaning
“Green around the gills” describes someone who looks pale, nauseated, or as though they may be sick.
In a Sentence
The rough boat ride left several passengers green around the gills.
Other Ways to Say It
- Looking nauseous
- Looking queasy
- Feeling sick to the stomach
- Looking pale
Explanation
The phrase creates a memorable visual image of a person’s face taking on a greenish appearance because of nausea.
It is especially useful when you want to describe how sickness looks, rather than simply stating that someone is ill.
Best Use
Best for storytelling, descriptive writing, conversations, and humorous situations. It has a colorful, informal tone.
Off Color
Meaning
When someone is “off color,” they are feeling slightly unwell or not quite themselves physically.
In a Sentence
Tom looked a little off color, so he decided to rest at home.
Other Ways to Say It
- Slightly unwell
- Under the weather
- Not quite well
- Feeling off
Explanation
The expression suggests that someone’s normal condition or appearance has changed. It often communicates mild sickness rather than severe illness.
It can also describe someone who looks pale or unhealthy, making it useful for both physical appearance and general wellbeing.
Best Use
It works well in casual conversation and descriptive writing. The expression can sound somewhat traditional, depending on the speaker.
Come Down With Something
Meaning
To “come down with something” means to develop an illness, often unexpectedly.
In a Sentence
I think I am coming down with something because my throat hurts and I feel exhausted.
Other Ways to Say It
- Develop an illness
- Get sick
- Catch something
- Start feeling ill
Explanation
This expression focuses on the beginning of an illness. It is often used when someone notices early symptoms and suspects that they are becoming sick.
It is useful because it does not require you to know exactly what the illness is.
Best Use
Best for everyday conversation, texts, informal messages, and personal stories.
Down With Something
Meaning
Being “down with something” can mean being sick with a particular illness, especially when the illness is keeping someone at home or inactive.
In a Sentence
She has been down with the flu since Monday.
Other Ways to Say It
- Sick with the flu
- Ill with something
- Battling an illness
- At home with an illness
Explanation
The word “down” suggests that illness has taken someone out of their normal routine. It can imply that the person is spending time resting rather than working or going out.
The expression is more informal than medical terminology.
Best Use
Use it in casual conversation, messages, and informal storytelling.
Laid Low
Meaning
“Laid low” means that an illness or other problem has left someone weak, inactive, or unable to continue normal activities.
In a Sentence
A severe fever laid him low for several days.
Other Ways to Say It
- Left him weak
- Knocked him out
- Kept him in bed
- Made him unable to function normally
Explanation
The expression creates the image of someone who has been brought down by illness and forced to stop their usual activities.
It generally sounds stronger and more dramatic than saying someone feels slightly sick.
Best Use
It works especially well in storytelling, essays, biographies, and descriptive writing.
Feeling Rough
Meaning
“Feeling rough” means feeling physically unwell, exhausted, or generally miserable.
In a Sentence
I had a late night and woke up feeling rough this morning.
Other Ways to Say It
- Feeling awful
- Feeling terrible
- Feeling unwell
- Feeling lousy
Explanation
The word “rough” suggests that the body is going through an uncomfortable or unpleasant period. Depending on context, it can refer to illness, exhaustion, or even feeling bad after too much alcohol.
It is a very informal expression, so context matters.
Best Use
Best for casual conversations, texts, and informal personal writing.
Feeling Poorly
Meaning
“Feeling poorly” means feeling ill or physically unwell.
In a Sentence
Granddad has been feeling poorly, so he is taking it easy today.
Other Ways to Say It
- Feeling unwell
- Feeling sick
- Feeling ill
- Not feeling well
Explanation
This expression is gentle and understated. It can make illness sound less dramatic and is often used when someone wants to describe feeling unwell without giving many details.
It is particularly common in British English.
Best Use
Useful in everyday speech, family conversations, and informal writing, especially in British English.
Not Feeling Oneself
Meaning
If someone is “not feeling themselves,” they do not feel physically or emotionally normal.
In a Sentence
He has been quiet all morning and says he is not feeling himself today.
Other Ways to Say It
- Not feeling well
- Feeling off
- Not at one’s best
- Feeling unlike oneself
Explanation
This expression is broader than simply being sick. It can describe illness, tiredness, stress, or a general sense that something is wrong.
That flexibility makes it useful when the exact cause of the discomfort is unclear.
Best Use
Best for conversations, personal messages, storytelling, and gentle descriptions of someone’s condition.
Out of Sorts
Meaning
“Out of sorts” means feeling unwell, uncomfortable, unsettled, or not in your usual mood.
In a Sentence
I have felt out of sorts since waking up, so I am going to have an early night.
Other Ways to Say It
- Feeling off
- Not quite right
- Under the weather
- Feeling unsettled
Explanation
The expression does not necessarily mean serious physical sickness. Instead, it suggests that something has disturbed your normal sense of wellbeing.
It can describe a mixture of minor physical discomfort and low mood, making it more flexible than many illness-related expressions.
Best Use
Good for conversation, personal writing, and character descriptions.
Run Down
Meaning
Being “run down” means feeling weak, tired, or lacking energy, sometimes because of illness, stress, or too little rest.
In a Sentence
After weeks of working late, she felt completely run down.
Other Ways to Say It
- Exhausted
- Worn out
- Low on energy
- Drained
Explanation
The image suggests that a person’s physical or mental energy has gradually been used up. It does not necessarily mean the person has a specific illness.
This makes it useful for describing the tired, depleted side of feeling sick.
Best Use
Best in everyday conversation, workplace discussions, personal writing, and storytelling.
A Bit Peaky
Meaning
“A bit peaky” means looking or feeling slightly unwell, weak, or pale.
In a Sentence
You look a bit peaky today—are you getting enough rest?
Other Ways to Say It
- Looking unwell
- Looking pale
- Looking tired
- Not looking your best
Explanation
The expression is often used to describe someone’s appearance, especially when they look pale or lacking energy.
It is gentle rather than dramatic, which makes it useful when you want to show concern without making someone sound seriously ill.
Best Use
Best for casual conversation and descriptive writing, particularly in British English.
As Sick as a Parrot
Meaning
“As sick as a parrot” is a humorous British expression that can mean extremely disappointed or upset. In some contexts, it can also be used literally or jokingly around sickness, but disappointment is its more established figurative sense.
In a Sentence
He was as sick as a parrot when his team lost the final.
Other Ways to Say It
- Extremely disappointed
- Gutted
- Heartbroken
- Very upset
Explanation
This is an important example of context and nuance. Although the word “sick” appears in the expression, it does not normally mean physically ill.
It is useful for learners because it shows why idioms should be understood as complete expressions rather than word by word.
Best Use
Best for informal British English, sports conversations, humorous writing, and storytelling. It is not appropriate for formal medical contexts.
Turn One’s Stomach
Meaning
To “turn one’s stomach” means to cause someone to feel nauseated or disgusted.
In a Sentence
The strong smell of spoiled food turned my stomach.
Other Ways to Say It
- Make someone nauseous
- Make someone feel sick
- Cause disgust
- Make someone queasy
Explanation
The expression uses the stomach as a physical symbol of nausea and disgust. Something unpleasant can literally make you feel as though your stomach is twisting.
It can describe physical nausea or strong disgust, depending on context.
Best Use
Useful in descriptive writing, storytelling, conversations, and discussions of unpleasant sights or smells.
Make One’s Stomach Turn
Meaning
“Make one’s stomach turn” means to cause a strong feeling of nausea, discomfort, or disgust.
In a Sentence
The sight of the rotten food made my stomach turn.
Other Ways to Say It
- Make someone feel nauseous
- Make someone queasy
- Make someone feel sick
- Cause a wave of nausea
Explanation
This expression gives the reader a physical image of the stomach reacting to something unpleasant.
It is especially effective when describing strong sensory reactions, such as seeing blood, smelling spoiled food, or witnessing something disturbing.
Best Use
Best for creative writing, storytelling, conversations, and vivid descriptions.
Have a Weak Stomach
Meaning
To “have a weak stomach” means to be easily affected by unpleasant food, smells, sights, or other things that cause nausea.
In a Sentence
I have a weak stomach, so I avoid watching medical procedures.
Other Ways to Say It
- Be easily nauseated
- Be sensitive to unpleasant sights
- Have difficulty with certain foods
- Be easily queasy
Explanation
This expression describes a person’s sensitivity to things that can cause nausea or discomfort rather than saying that they are currently sick.
It is useful when explaining why someone reacts strongly to a particular situation.
Best Use
Works naturally in everyday conversations, personal explanations, and storytelling.
Back on One’s Feet
Meaning
“Back on one’s feet” means recovered enough to return to normal activities, often after illness or exhaustion.
In a Sentence
After a week of rest, Maya was finally back on her feet.
Other Ways to Say It
- Recovered
- Feeling better
- Returning to normal
- Getting back to normal
Explanation
The image is of someone who was unable to function normally but is now physically strong enough to stand and carry on again.
Unlike most expressions on this list, it focuses on recovery rather than being sick.
Best Use
Useful in conversations, supportive messages, storytelling, and informal writing.
On the Mend
Meaning
Being “on the mend” means gradually recovering from an illness or injury.
In a Sentence
He is still resting, but he is definitely on the mend.
Other Ways to Say It
- Recovering
- Getting better
- Improving
- Healing
Explanation
The phrase suggests a gradual process rather than an instant recovery. It gives a hopeful sense that someone’s condition is moving in the right direction.
It can sound reassuring when talking about someone who has recently been ill.
Best Use
Best for conversations, personal messages, family updates, and storytelling.
Up and About
Meaning
“Up and about” means someone is out of bed and moving around again, usually after being sick, injured, or confined to bed.
In a Sentence
After several days in bed, Dad is finally up and about again.
Other Ways to Say It
- Out of bed
- Moving around
- Active again
- Back to normal activities
Explanation
The phrase creates a simple picture of someone who is no longer confined to bed. It often signals a visible improvement in health.
It does not necessarily mean someone is completely recovered; they may simply be well enough to move around.
Best Use
It works well in everyday conversation, family updates, storytelling, and informal writing.
Exercise: Practice Using Idioms
Choose the best answer for each question.
Which idiom usually means feeling mildly unwell?
A. On the mend
B. Under the weather
C. Back on one’s feet
D. Up and about
What does “green around the gills” usually suggest?
D. Feeling relaxed isy bii
A. Experiencing hunger
B. Having plenty of energy
C. Experiencing nausea
D. Enjoying a relaxed state
Which expression means developing an illness?
A. Come down with something
B. Have a weak stomach
C. On the mend
D. Back on one’s feet
If someone is “laid low” by illness, what does that suggest?
A. Celebrating a special occasion
B. Recovering completely
C. Exercising regularly
D. Struggling to continue normal activities
Which expression can describe someone who looks pale and unwell?
A. A bit peaky
B. Up and about
C. On the mend
D. Back on one’s feet
What does “run down” usually communicate?
A. Experiencing high energy
B. Feeling tired and depleted
C. Experiencing hunger
D. Showing excitement
Which idiom means gradually recovering?
A. Sick as a dog
B. Green around the gills
C. On the mend
D. Turn one’s stomach
“Turn one’s stomach” can describe which reaction?
A. Nausea or disgust
B. Happiness
C. Confidence
D. Sleepiness
Which expression does NOT normally mean physically sick?
A. Feeling poorly
B. Under the weather
C. As sick as a parrot
D. Feeling rough
What does “not feeling oneself” suggest?
A. Feeling completely normal
B. Experiencing physical or emotional discomfort
C. Recovering fully
D. Pretending to be sick
Which phrase describes someone who is moving around again after being ill?
A. Down with something
B. Green around the gills
C. Up and about
D. Laid low
Which expression is particularly useful for describing strong nausea caused by something unpleasant?
A. Make one’s stomach turn
B. Back on one’s feet
C. A bit peaky
D. Feeling poorly
What does “have a weak stomach” mean?
D. To have a serious illness isy bii
A. Experiencing extreme hunger
B. Recovering quickly
C. Being easily affected by unpleasant sights, smells, or foods
D. Suffering from a serious illness
Which expression can refer to both physical discomfort and feeling emotionally unsettled?
A. Out of sorts
B. Sick as a dog
C. Come down with something
D. On the mend
Which phrase most directly describes being sick with a particular illness?
A. Up and about
B. Down with something
C. Back on one’s feet
D. A bit peaky
Answers
- B — “Under the weather” means feeling mildly unwell or below your normal condition.
- C — “Green around the gills” commonly describes someone who looks or feels nauseated.
- A — “Come down with something” means to develop an illness.
- D — Being “laid low” means an illness has left someone weak or unable to continue normal activities.
- A — “A bit peaky” describes someone who looks slightly pale or unwell.
- B — “Run down” suggests being tired, weak, or depleted.
- C — “On the mend” means gradually recovering from an illness or injury.
- A — “Turn one’s stomach” means to cause nausea or disgust.
- C — “As sick as a parrot” is commonly used figuratively for being extremely disappointed, particularly in British English.
- B — “Not feeling oneself” means someone does not feel physically or emotionally normal.
- C — Someone who is “up and about” is out of bed and moving around again.
- A — “Make one’s stomach turn” describes a strong reaction of nausea or disgust.
- C — Having “a weak stomach” means being easily affected by things that cause nausea or discomfort.
- A — “Out of sorts” can describe feeling physically unwell, unsettled, or unlike one’s usual self.
- B — “Down with something” means being sick with an illness.
FAQs
What is an idiom for sick?
There are several useful idioms for sick, depending on the situation. “Under the weather” is a common casual expression for feeling mildly unwell, while “sick as a dog” suggests much stronger sickness. Other expressions focus on nausea, tiredness, or recovery.
How do I create my own idiom?
A useful figurative expression starts with a clear image connected to the feeling you want to communicate. Think about what sickness looks, feels, or behaves like, then create a comparison that readers can understand from context.
What makes an idiom effective?
An effective idiom creates a clear mental image while communicating an idea naturally. The best expressions are easy to understand, fit the situation, and add something beyond a simple literal statement.
Can I use these idioms in everyday conversation?
Yes, many of them work naturally in casual conversation. Expressions such as “under the weather,” “feeling rough,” “run down,” and “on the mend” are especially useful. Some expressions are more informal or region-specific, so formal medical writing should generally use direct language instead.
What is the difference between an idiom and a simile?
An idiom has an established figurative meaning, while a simile directly compares two things using words such as like or as. For example, “under the weather” is an idiomatic expression, while “as sick as a dog” uses an explicit comparison within an established expression.
Conclusion
English gives us many ways to describe being sick without relying on the same basic words again and again. Expressions such as “under the weather,” “green around the gills,” “laid low,” and “run down” can communicate different shades of illness, discomfort, weakness, and nausea. Others, including “on the mend,” “back on one’s feet,” and “up and about,” shift the focus toward recovery and renewed energy.
The key is to choose an expression that matches the situation and the tone you want. A playful idiom may suit a conversation with friends, while straightforward language is usually better for professional or medical communication. When used thoughtfully, figurative language can make descriptions of feeling sick clearer, more vivid, and more human.
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