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Act up

//ækt ˈʌp// verb

Definitions

Verb
  1. 1
    To misbehave; to cause trouble. idiomatic, intransitive

    "My allergies act up during hay fever season."

  2. 2
    make itself felt as a recurring pain wordnet
  3. 3
    To perform the duties of an appointment senior to that actually held; to deputise for a superior. idiomatic, intransitive

    "Acting up is always recommended when you find yourself under a new boss."

  4. 4
    misbehave badly; act in a silly or improper way wordnet

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