- 1 • informal (Of a thing) fail to function properly: the plane’s engine was acting upMore example sentences
- The laptop computer that we have been using for performing pulmonary function tests had been acting up lately, overheating and shutting itself off.
- Then again, my body did like to pick the wrong times to start acting up.
- I think the service is messed up here, it was acting up before the phone broke.
- 1.1Behave badly: all children talk back and act up from time to timeMore example sentences
misbehave, give someone trouble, cause someone trouble, act badly, get up to mischief, get up to no good, be bad, be naughty, forget oneself, misconduct oneself; clown about/around, fool about/around, act the clown, act the fool, act the goat, act foolishly• informal carry on, mess about/aroundBritish • informal muck about/around, play up
- In his three-year-old debut at Gulfstream in January, Friends Lake acted up at the gate and ran badly in the Holy Bull, finishing third, 12 lengths behind the winner.
- The day we visit the kindergarten is only the second time in his life that Ed acts up.
- The teenager was asked about conversations he had with the dean at Los Angeles' John Burroughs Middle School, where the boy had a history of acting up in class.
- 2Be promoted to a more senior position on a temporary basis.More example sentences
- What is the process for being put forward for promotion or acting up; your line manager can do it, or somebody you work with can do it, but somebody else has a final say?
- When someone is acting up it takes another uniform off the street,’ he said.
- He said: ‘There have been problems due to some staff being unwilling to act up.’
More definitions of act upDefinition of act up in:
- The US English dictionary