Definition of hit on phrasal verb from the Oxford Advanced Learner's Dictionary

 

hit on

 phrasal verb
phrasal verb
 
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Phrasal Verbs
(North American English, slang) to start talking to somebody to show them that you are sexually attracted to them

hit on something

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hit upon something

 
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[no passive] (rather informal) to think of a good idea suddenly or by chance She hit on the perfect title for her new novel.
See the Oxford Advanced American Dictionary entry: hit on