What does act up mean?

Looking for the meaning or definition of the word act up? Here's what it means.

Verb (intransitive, idiomatic) To misbehave; to cause trouble. (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?) Find more words! 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So at school I used to act up and get into trouble, and then I'd go home to my mum and start crying because I thought the teacher didn't like me. I don't think psychologists have to deal with their own computers when they start to act up. Some kids act up or throw tantrums, while some develop physical symptoms such as headaches or insomnia. To the extent that he had greater experience that was because he had been allowed to act up on the retirement of Ms Herman. As reported last month, the unofficial action involves firefighters across London refusing to act up as officers. See Also What is another word for act up? What is the opposite of act up? Sentences with the word act up Words that rhyme with act up What is the past tense of act up? Nearby Definitions actuosity actuose actuopalynology actuators actuator actuations act upon act up to acture acturience actus actus rei