Play something down:
To “play something down” is to say that it isn’t important.
Apparently he used to be an Olympic swimmer, but he's always trying to play it down.
Play up:
If something mechanical “plays up” that thing doesn’t work properly.
Sorry, I couldn't do the photocopying because the photocopier was playing up again.
Play up:
To be naughty and difficult to control (used especially with children).
Have the children been playing up again?
Play along with someone/something:
If you “play along with someone”, you pretend to agree with them and act as if you accept their ideas even though you don’t really.
Dad still thinks we believe in Santa. Just play along with him. It keeps him happy.
Play through (a piece of music):
To play a song from the beginning to the end.
That was good but not perfect. Now, let's play trough the entire 4-hour opera once more.
Play with someone’s feelings:
To use an emotionally vulnerable and sensitive person for your own benefit.
Do you really love me, or are you just playing with my feelings?