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general::
Phrase(s): (I’ve) been under the weather.
Fig. a greeting response indicating that one has been ill. • John: How have you been? Sally: I’ve been under the weather, but I’m better. • Doctor: How are you? Mary: I’ve been under the weather. Doctor: Maybe we can fix that. What seems to be the trouble?
McGrawhill's American Idioms And Phrasal Verbs