under the weather

Cultural  

1. Indisposed, unwell: “The day after the big party, Jay had to call in sick, saying he was feeling under the weather.”

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under the weather Idioms  

1. 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.

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Example Sentences

It was wilting under the weather and the weight of a team from Iowa.

From Los Angeles Times

Freida repeated in her later post that her sister has “been a little under the weather” and said she “simply asked for prayers because I believe so strongly in the power of prayer.”

From Los Angeles Times

"I felt a bit under the weather, but I was still going about my daily life," she said.

From BBC

LIV said it was because of illness and he had been "feeling under the weather all week".

From BBC

Being under the weather couldn't keep Morgan from keeping tabs on the team and his Knicks-branded phone case was visible in the photo.

From Salon