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act up

   Also found in: Dictionary/thesaurus, Acronyms, 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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* "Naked Truth" demo ("The emperor has no clothes"): On August 26, a few days before the start of the RNC, nine members of ACT UP New York and ACT UP Philadelphia stopped traffic and took off their clothes in front of Madison Square Garden, where the convention would be held.
ACT UP is down to a handful of chapters and members, but its old fire still smolders
ACT UP embodied the passion, communal spirit, creativity, and courage that attracts people to political activism.
 
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