act up

act up: Misbehave badly; act in a silly or improper way.
Example: The children acted up when they were not bored.
This typewriter is acting up again.

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What are a phrasal verbs ?

A phrasal verbs are usually two-word phrases consisting of verb and preposition, a verb and an adverb, or a verb with both an adverb and a preposition that change the meaning to make a new verb.

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