act up
Definition of act up
intransitive verb
1 : to act in a way different from that which is normal or expected: such asa : to behave in an unruly, recalcitrant, or capricious manner the children were acting upb : show offc : to function improperly this typewriter is acting up again
2 : to become active or acute after being quiescent her rheumatism started to act up
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Examples of act up in a Sentence
the two-year-old was acting up in church so much that her dad had to take her outside
you should have seen the boys acting up when they put on their aprons
First Known Use of act up
1879
ACT UP
Definition of ACT UP
AIDS Coalition to Unleash Power
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