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puff sth up

phrasal verb with puff
 
 
/pʌf/ verb

Definition

to become larger or full of air, or to make something become larger in this way: When the pastry is golden and puffed up, take the pie out of the oven.Becoming biggerEnlarging and inflatingEnlarging and inflatingBecoming bigger
(Definition of puff sth up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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