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English Dictionary

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 act up act up /ækt ʌp/

verb

  1. Make itself felt as a recurring pain  ( act up )
    make itself felt as a recurring pain
     My arthritis is acting up again
    My arthritis is acting up again
  2. Misbehave badly; act in a silly or improper way  ( act up , carry on )
    misbehave badly; act in a silly or improper way
     The children acted up when they were not bored
    The children acted up when they were not bored