- (Britain, idiomatic) To misbehave
- Children who do not receive enough attention may begin to play up.
- The radar system is playing up again.
- (idiomatic) To make or attempt to make something appear more important, likely or obvious; to showcase or highlight
- For the audition, Nicole will play up her skill as a pianist by playing Jesu, Joy of Man's Desiring by Bach.
- (to misbehave): act up