ACT UP


Meaning of ACT UP in English

act up phrasal verb ( see also ↑ act )

1 . if children act up, they behave badly:

He’s a tough kid and he acts up a lot.

2 . if a machine or part of your body acts up, it does not work properly:

The computer is acting up again.

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.