Ailing, ill; also, suffering from a hangover. For example, She said she was under the weather and couldn't make it to the meeting. This expression presumably alludes to the influence of the weather on one's health. [Early 1800s] The same term is sometimes used as a euphemism for being drunk, as in After four drinks, Ellen was a bit under the weather.
COMMON If you are under the weather, you are feeling ill. I'd been feeling a bit under the weather for a couple of weeks.She was suffering from stress and generally under the weather.
Unwell, out of sorts. This phrase is thought to allude to being under the influence of weather that causes one to feel ill. Oddly enough, several early appearances in print deny that it means genuinely ill, the sense in which it is generally used today. Thus, William Dunlap wrote (The Memoirs of a Water Drinker, 1836), “He seems a little under the weather, somehow; and yet he’s not sick.”
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