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. When screaming schoolyard bullies act up, the teacher often isolates them in a corner, forcing them to reflect upon their actions. The head of the school says the children were encouraged to act up for the cameras. Later, her mom told me that she had an impacted wisdom tooth which was just starting to act up, and which I had helped to make go away. Some kids act up or throw tantrums, while some develop physical symptoms such as headaches or insomnia. 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