Laxi Dictionary

American Dictionary

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Definition act up in American English

act up phrasal verb

[intransitive] phrasal verb
1

if children act up, they behave badly

Example

The kids have been acting up again.

2

if a part of your body or a piece of equipment acts up, it starts to become painful or to develop problems

Example

I hope my back doesn't start acting up again.

Synonyms and related words
suffer hurt ache
Definition act up in American English