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plump sth up

phrasal verb with plump
 
 
/plʌmp/ verb [T]

Definition

to make something fuller or fatter: She went round plumping up the cushions. Lips can be plumped up with injections.Enlarging and inflatingBecoming bigger
(Definition of plump sth up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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