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Definition of flash adjective from the Oxford Advanced Learner's Dictionary

flash

adjective
 
/flæʃ/
 
/flæʃ/
(British English, informal, disapproving)
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  1. attracting attention by being large or expensive, or by having expensive clothes, etc.
    • a flash car
    • He's very flash, isn't he?
    • He always was a bit of a flash dresser.
    Word OriginMiddle English (in the sense ‘splash water about’): probably imitative; compare with flush ‘cleanse’ and splash.
See flash in the Oxford Advanced American Dictionary
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adverb
 
 
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