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



BrE BrE//flæʃ//
; NAmE NAmE//flæʃ//
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(British English, informal, disapproving) 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 the Oxford Advanced American Dictionary entry: flash