Meaning of “hit on/upon sth” - Learner’s Dictionary

hit on/upon sth

phrasal verb with hit us uk /hɪt/ verb present participle hitting, past tense and past participle hit

to have a good idea, especially one that solves a problem:

We hit upon the idea of writing to the mayor to ask for his help.

(Definition of “hit on/upon sth” from the Cambridge Learner’s Dictionary © Cambridge University Press)