on the wrong side of

(on) the wrong side of (some age)

Older than a certain age. Why is she dressing like a teenager when she is clearly the wrong side of 40? I get sore after every workout now that I'm on the wrong side of 30! I knew I was on the wrong side of 20 when started gaining weight from my usual diet of junk food and lack of exercise.
See also: of, side, wrong

on the wrong side of (someone)

Displeasing to someone; provoking someone's anger, contempt, or dismissal. The best way to get through this class is to say nothing unless called upon, and to make sure you don't get on the wrong side of the teacher! I thought it was all in good fun, but I might have gotten on the wrong side of her with my sarcastic comments.
See also: of, on, side, wrong
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

*on the wrong side of someone

 and *on someone's wrong side
Fig. out of favor with someone. (*Typically: be ~; get ~.) Don't get on the wrong side of her. I do what I can not to get on the wrong side of people.
See also: of, on, side, wrong
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
See also: