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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 act up in the Oxford Advanced Learner's Dictionary

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