play up
verb
RareNot in standard dictionaries
1
Used other than figuratively or idiomatically: see play, up.
2
To misbehave.
3
To make or attempt to make something appear more important, likely, or obvious; to showcase or highlight.
4
To play (e.g. sport or music) more vigorously.
5
To be unfaithful to a lover; to cheat; used with on.
Thesaurus
#slang