Play about
Be silly
Play along
Pretend to agree or accept something in order to keep someone happy or to get more information
Play around
Be silly
Play at
Pretend to be something
Play away
Be sexually unfaithful when away from home
Play back
Listen to or watch something you've recorded
Play down
Try to make something seem less important
Play off
Play a game to decide who the winner is
Play on
Continue playing a sport though there might be a reason to stop
Play out
Progress, often till it finishes
Play up
Behave badly
Play up to
Flatter someone
Play upon
Exploit a weakness
Play with
Touch and move something to occupy your hands