Usually means: Behave improperly or rebelliously.
Definitions Related words Phrases (New!) Mentions
We found 21 dictionaries that define the word act up:

General (16 matching dictionaries)
  1. ACT UP, act up: Merriam-Webster.com
  2. act up: Oxford Learner's Dictionaries
  3. act up: Collins English Dictionary
  4. act up: Vocabulary.com
  5. act up: Cambridge Advanced Learner's Dictionary
  6. act up: Wiktionary
  7. ACT-UP, act up: Dictionary.com
  8. ACT-UP, ACT UP, Act Up (song), Act Up, Act up: Wikipedia, the Free Encyclopedia
  9. act up: Rhymezone
  10. act up: Phrasal Verb Page
  11. act up: Free Dictionary
  12. act up: Mnemonic Dictionary
  13. act up: Dictionary/thesaurus
  14. act up: Merriam-Webster.com

Medicine (1 matching dictionary)
  1. ACT-UP: Medical dictionary

Miscellaneous (2 matching dictionaries)
  1. ACT-UP, ACT UP: Acronym Finder
  2. act up: Idioms

Slang (2 matching dictionaries)
  1. act up: Green’s Dictionary of Slang
  2. act up: Urban Dictionary

(Note: See act_ups as well.)

Definitions from Wiktionary (act up)

verb:  (intransitive, idiomatic) To misbehave; to cause trouble.
verb:  (intransitive, idiomatic) To perform the duties of an appointment senior to that actually held; to deputise for a superior.

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