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English definition of “puff sth out”

puff sth out

verb uk phrasal verb with puff   /pʌf/ us  
to make your chest or your face become bigger by filling it with air: He puffed out his cheeks and sat back in his chair.Enlarging and inflatingBecoming bigger
(Definition of puff sth out from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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