hit on

verb2

1. •
   (slang) To flirt with; to approach and speak to (someone), seeking romance, love, sex, etc.

   • That's the third guy that has hit on her tonight.
   • Guys are hitting on them almost all the time.
2. •
   To discover, pinpoint; to think up; to realize.

   • He hit on a great idea for improving the design.
   • I think you've just hit right on the solution.