SINCE 1828
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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