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act up

phrasal verb

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act up (informal)

to behave badly表现不好；捣乱
- The kids started acting up.孩子们开始调皮捣蛋起来。🔊🔊
to not work as it should出毛病
- How long has your ankle been acting up?你的脚踝受伤多久了？🔊🔊