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"
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). act up. Retrieved September 20, 2026, from http://smartdefine.org/act_up/definitions/1254673
ChicagoWordNet. 2010. "act up" http://smartdefine.org/act_up/definitions/1254673 (accessed September 20, 2026).
HarvardWordNet 2010, act up, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/act_up/definitions/1254673>.
MLAWordNet. "act up" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/act_up/definitions/1254673>