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- (intransitive, idiomatic) To misbehave; to cause trouble.
- My allergies act up during hay fever season.
- Children may act up in class in an effort to get attention.
- (intransitive, idiomatic) To perform the duties of an appointment senior to that actually held; to deputise for a superior. (Can we add an example for this sense?)
- (misbehave): carry on