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act up in WordNet English dictionary
verb- make itself felt as a recurring pain
"My arthritis is acting up again"
act up
- misbehave badly; act in a silly or improper way
"The children acted up when they were not bored"
act up carry on
WordNet Lexical Database v3.0, © 2006 Princeton University
act up in English Wiktionary
- (verb) (idiomatic) To misbehave; to cause trouble.
Wiktionary, GNU Free Documentation Licence