Longman Dictionary of Contemporary English homepage

Sense: 1,4
Date: 1500-1600
Origin: PLUMP1
Sense: 2-3,5
Date: 1200-1300
Origin: Copying the action

plump

2 verb
     
plump2
1 also plump up [transitive] to make cushions, pillows etc rounder and softer by shaking or hitting them
2

plump (yourself) down

to sit down suddenly and heavily [= plonk]
3 [transitive always + adverb/preposition] to put something down suddenly and carelessly [= plonk]:
Plump the bags down anywhere you like.
4 also plump up [intransitive and transitive] if dried fruit plumps up, or if you plump it up, it becomes fatter and softer when in liquid:
Soak the apricots and raisins until the fruit plumps up.

plump for something/somebody

phrasal verb
to choose something or someone after thinking carefully about it:
Finally we plumped for a bottle of champagne.

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