make a pass at someone
make a pass at (one)
To make sexual advances toward or propositions to one; to hit on one. Do you think she was making a pass at me, or was she just being nice? I'm tired of complete strangers making a pass at me when I go out.
make a pass at someoneINFORMAL
If someone makes a pass at you, they try to begin a romantic or sexual relationship with you. Nancy wasn't sure if Dirk was making a pass at her.