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English definition of “fluff”

fluff

verb [T]     /flʌf/ (US also flub) informal
to fail something or do it badly: I fluffed my driving test three times before I finally got it. All the time I was acting with him, I never once heard him fluff his lines (= say something wrong when acting).Failing and doing badly
(Definition of fluff verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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