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

 

flash on

 phrasal verb
phrasal verb
 
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Phrasal Verbs
(US English, informal) [no passive] if something flashes on you, you suddenly realize it it flashes on somebody that… It flashed on me that he was the man I'd seen in the hotel.
(US English, informal) to suddenly remember or think of something I flashed on an argument I had with my sister when we were kids. She flashed on the idea of writing a novel about her experiences.
See the Oxford Advanced American Dictionary entry: flash on