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English definition of “flash”

flash

verb (SHOW QUICKLY)    /flæʃ/
C2 [T] to show something for a short time: He flashed a smile and offered to buy me a drink.Showing and demonstrating [I or T] informal If someone flashes, they show their sexual organs in public: He came out of the bushes and flashed at me.Sexual activity in generalPhysical and sexual assault and abduction
(Definition of flash verb (SHOW QUICKLY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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