Learn what "you've been acting up lately" means, when people say it, and how to use it naturally in English.

It means the speaker thinks the other person has been misbehaving or causing trouble recently.
From Billionaire’s Betrayal, Episode 13
Someone complains that the other person has been behaving badly lately.
Use this when complaining about someone's behavior, especially to a child or in a tense argument. It can sound scolding.
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