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act up

   Also found in: Dictionary/thesaurus, Medical, Legal, Financial, Acronyms, Encyclopedia, Wikipedia 0.01 sec.
act up
[for a thing or a person] to behave badly. This car is acting up again.
See also: act, up

act up
1. to behave badly Sometimes kids act up because they just want attention.
Usage notes: usually used to refer to children
2. to operate badly My computer began acting up and I lost a whole day's work.
3. to become active Her allergies acted up when she went hiking in the woods.
Usage notes: usually used to refer to a medical condition
See also: act, up


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