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Definition of plump up - 2 dictionary results
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plump

1  [pluhmp] adjective, -er, -est, verb
Use plump up in a Sentence
–adjective
1. well filled out or rounded in form; somewhat fleshy or fat.
–verb (used without object)
2. to become plump (often fol. by up or out).
–verb (used with object)
3. to make plump (often fol. by up or out): to plump up the sofa pillows.
Origin:
1475–85; earlier plompe dull, rude < MD plomp blunt, not pointed; c. MLG plump

Related forms:
plumply, adverb
plumpness, noun

Synonyms:
1. portly, round. See stout. 2, 3. fatten.

Antonyms:
1. thin.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Plump at Amazon
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Word Origin & History

plump  (adj.)
1481, "blunt, dull" (in manners), from Du. plomp "blunt, thick, massive, stumpy," probably related to plompen "fall or drop heavily" (see plump (v.)). Meaning "fleshy, of rounded form" is from 1545.
Online Etymology Dictionary, © 2001 Douglas Harper
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