ACT UP meaning: Behave improperly or rebelliously

We found 22 dictionaries that define the word act up:

General (17 matching dictionaries)

ACT UP, act up: Merriam-Webster
act up: Oxford Learner's Dictionaries
act up: Collins English Dictionary
act up: Vocabulary.com
act up: Cambridge Advanced Learner's Dictionary
act up: Wiktionary
ACT-UP, act up: Dictionary.com
ACT-UP, ACT UP, Act Up (song), Act Up, Act up: Wikipedia, the Free Encyclopedia
act up: Rhymezone
act up: Phrasal Verb Page
act up: FreeDictionary.org
act up: Mnemonic Dictionary
act up: TheFreeDictionary.com
act up: Longman Dictionary of Contemporary English
act up: Merriam-Webster

Medicine (1 matching dictionary)

ACT-UP: Medical dictionary

Miscellaneous (2 matching dictionaries)

ACT-UP, ACT UP: Acronym Finder
act up: Idioms

Slang (2 matching dictionaries)

act up: Green’s Dictionary of Slang
act up: Urban Dictionary

(Note: See act_ups as well.)

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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.

Opposite:

behave, comply, obey, conform

Types:

misfire, malfunction, break down, crash, stall, stall out, more...

Phrases:

to act up to, act of giving up, more...

Adjectives:

screwed up, beef, whoopsy, ree, bang up, botched up, bad, wax, bungled, teen, wrecked

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