If you are under the weather, you feel a bit ill or not quite yourself.
Examples
I'm feeling a bit under the weather, so I'll skip the gym tonight.
Maya looked under the weather at breakfast, so her dad made her a cup of tea.
Sorry I missed the meeting. I was under the weather yesterday, but I'm fine now.
When do people use it?
People use it for mild, short-term illness, for example:
- a cold or a sore throat
- a headache or feeling very tired
- an upset stomach
- that vague "I'm not quite right today" feeling
It is also a polite, vague way to say you're ill without giving details. That makes it perfect for a message to your boss or a friend.
You will usually hear it with feel, be or look, often softened with a bit or slightly:
I've been feeling slightly under the weather all week.
The odd part: why under the weather?
Think about it: nobody feels ill because of the weather while sitting in a warm kitchen on a sunny day. So why does the expression put you under the weather?
- Under often means being pressed down by something in English: under pressure, under stress, under attack. When you are under something, it is affecting you.
- Weather is the classic thing you can't control. It changes your plans, your mood and, for anyone working outdoors or at sea, your whole day.
Put them together, and being under the weather paints a picture of being weighed down by something bigger than you. That picture stayed, even though the expression now has nothing to do with real weather.
Where did it come from?
The honest answer: nobody knows exactly. Here is what the evidence shows.
- The earliest known printed use is from 1803, in an American newspaper. Early uses meant being in trouble or in difficulties, not being ill. The "unwell" meaning appears only a few years later.
- Most word historians agree the phrase probably began as sailors' language. One real sailing expression, under the weather shore, described sheltering near land, out of the worst of a storm.
- A popular story says seasick sailors were sent below deck to shelter from the weather. It is repeated a lot, but researchers have found no early examples of the phrase used that way. Treat it as a good story, not history.
Common mistakes
Don't forget the.
❌ I'm feeling a bit under weather.
✅ I'm feeling a bit under the weather.
Keep it for mild illness.
❌ Grandpa is under the weather after his heart surgery.
✅ Grandpa is recovering after his heart surgery.
Under the weather sounds light and casual. For a serious illness or an operation, it can sound as if you are not taking it seriously.
In a conversation
Lea: Are you coming to the quiz night tonight?
Omar: I don't think so. I'm a bit under the weather.
Lea: Oh no! A cold?
Omar: Just a sore throat. Rest and soup, and I'll be fine by the weekend.
Similar expressions
- not feeling well: the most neutral choice. It works everywhere, from chatting with friends to calling a doctor's office.
- feeling off / a bit off: informal and very vague. Something isn't right, but you may not be ill at all: maybe just tired or not hungry.
- a bit ill or a bit sick: in British English, ill is the usual word. I feel sick often means you might vomit! In American English, sick simply means ill.
Under the weather sits between these: friendly, polite and a little softer than saying I'm ill.
Easy way to remember it
Imagine a small grey rain cloud that follows you around all day, hovering just above your head. You're under your own little bit of bad weather.
When that cloud is with you, you're not really sick. You just don't feel your best.
And if a real rain shower has just passed, you might even catch a whiff of petrichor, the fresh smell of rain on dry ground.
Quick check
- I'm feeling a bit ______ today. (under weather / under the weather)
- Is this natural? The doctor says Dad is under the weather after his heart surgery.
- A colleague writes: I'm a bit under the weather, so I'm working from home. How ill are they probably?
- True or false: historians know for certain that the phrase comes from seasick sailors sent below deck.
Answers
- under the weather: the the is part of the idiom.
- Not really. It is too light for something serious like surgery.
- Mildly ill, perhaps a cold or a headache. The phrase doesn't give details.
- False. A sailing origin is likely, but the seasick-sailor story has no early evidence.