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.
To discover, pinpoint; to think up; to realize.
He hit on a great idea for improving the design.
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.
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