hit on

verb

1. 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.”

3. Used other than figuratively or idiomatically: see hit, on.

   “He was hit on his head so strongly that he stumbled forward and then he was severely hit from several sides.”