act up


Definition of ACT UP

to behave badly <the two-year-old was acting up in church so much that her dad had to take her outside>
to engage in attention-getting playful or boisterous behavior <you should have seen the boys acting up when they put on their aprons>

March 27, 2015
quiescent Hear it
Tranquilly at rest or causing no trouble
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears