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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 a man flashes, he shows his 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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