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English definition of “fluff sth up”

fluff sth up

verb [T] uk phrasal verb with fluff   /flʌf/ (US also flub) informal us  
to make something appear bigger or full of air by hitting or shaking it: I'll just fluff up your pillows for you.Enlarging and inflatingBecoming biggerShaking, swinging and vibrating
(Definition of fluff sth up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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