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act up

[phrasal verb]
: to behave badly : to act in a way that is not polite or acceptable淘气;捣蛋
of a machine : to not work properly(机器)发生故障
of a disease : to become worse and to start causing pain or physical problems(疾病)发作
⇒ Main Entry: 2 act

act up

1 of 2

verb

acted up; acting up; acts up

intransitive verb

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
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

2 of 2

abbreviation

AIDS Coalition to Unleash Power

Synonyms

Example Sentences

Verb 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

Word History

First Known Use

Verb

1879, in the meaning defined at sense 1

Time Traveler
The first known use of act up was in 1879

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