act up
verbDefinition of act up
(Entry 1 of 2)
1 : to act in a way different from that which is normal or expected: such as
a : to behave in an unruly, recalcitrant, or capricious manner the children were acting up
b : show off
c : to function improperly this typewriter is acting up again
2 : to become active or acute after being quiescent her rheumatism started to act up
ACT UP
abbreviationDefinition of ACT UP (Entry 2 of 2)
AIDS Coalition to Unleash Power
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