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English definition of “hit on/upon sth”

hit on/upon sth

verb uk phrasal verb with hit   /hɪt/ (past participle hitting, past tense and past participle hit) us  
to think of an idea when you didn't expect or intend to, especially one that solves a problem: When we first hit on the idea, everyone told us it would never work.
(Definition of hit on/upon sth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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