hit on someone

hit (up)on (someone or something)

1. Literally, to strike someone or something in a particular spot. A noun or pronoun can be used between "hit" and "(up)on." Just hit on the top of the TV until the sound comes back on. A pair of shoes fell off the shelf in my closet and hit me right on the head.
2. To discover or realize something. I think we've finally hit upon the reason the experiment has been failing.
3. To flirt with someone, often when it is unwelcome. In this usage, the phrase is always "hit on" (not "upon"). Are you hitting on me? You're a married man!
See also: hit

hit on someone

in. to flirt with someone; to make a pass at someone. The women were all hitting on George, but he didn’t complain.
See also: hit, on, someone