act upRate this phrase:(5.00 / 6 votes)Say it
To misbehave; to cause trouble.

Children may act up in class in an effort to get attention.

Additional definitions for 'act up':

act upgive trouble
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"act up." Phrases.net. STANDS4 LLC, 2017. Web. 23 Oct. 2017. <http://www.phrases.net/phrase/act-up_14>.

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