Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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act up

 
See:
act
features:
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part of speech: phrase
definition 1: to behave in a bad or mischievous way; misbehave.
synonyms:
carry on, fool around, misbehave
similar words:
rebel
definition 2: to happen again or return, as an illness or malfunction.
My allergies are acting up.
synonyms:
return
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  behavior, disease