act up
Intermediate (B1)informal
When a person is being naughty or difficult, or when something stops working the way it should.
"The kids started acting up as soon as the babysitter arrived."
Hear it in context
Shopping to Replace my Totalled Car w/ Knut | Esfand Live 05/01/2026
Esfand · 16:33
Make me act up.
Uncle Skoob, Zae & Byrd React to Our Discord Members Basketball Highlights | Vol 1
BallislifeHoops · 11:16
Don't act up y'all.
Shopping to Replace my Totalled Car w/ Knut | Esfand Live 05/01/2026
Esfand · 68:36
You going to make me act up?
You Can Get Arrested In Dubai For Saying This...
Digital Social Hour Podcast by Sean Kelly · 11:54
much freedom because people can act up I
I Asked Famous Youtubers To Cook in Their Homes
Joshua Weissman · 1:22
That's gonna make me act up a little bit.