What is the meaning of act up?

verb

  • Misbehave badly; act in a silly or improper way.
    • usage: "The children acted up when they were not bored"
  • Make itself felt as a recurring pain.
    • usage: "My arthritis is acting up again"
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APAWordNet. (2010). act up. Retrieved September 24, 2018, from http://smartdefine.org/act_up/definitions/1254673
ChicagoWordNet. 2010. "act up" http://smartdefine.org/act_up/definitions/1254673 (accessed September 24, 2018).
HarvardWordNet 2010, act up, Smart Define, viewed 24 September, 2018, <http://smartdefine.org/act_up/definitions/1254673>.
MLAWordNet. "act up" 23 October 2010. Web. 24 September 2018. <http://smartdefine.org/act_up/definitions/1254673>