American English

Definition of act up phrasal verb from the Oxford Advanced American Dictionary

 

act up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    act up

    (informal)
     
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  1. 1to behave badly The kids started acting up.
  2. 2to not work as it should How long has your ankle been acting up?
See the Oxford Advanced Learner's Dictionary entry: act up

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