Meaning of ACT UP in English
- ACT UP
v. , informal 1. To behave badly; act rudely or impolitely. The dog acted up as the postman came to the door. 2. To work or run poorly (as a after all machine); skip; miss. The car acted up because the spark plugs were dirty.
American idioms English vocabulary. Английский словарь американских идиом. 2012