Etymology
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plump (adj.)

late 15c., "blunt, dull" (in manners), from Dutch plomp "blunt, thick, massive, stumpy," probably related to plompen "fall or drop heavily" (see plump (v.)). Meaning "full and well-rounded," of a person, "fleshy, chubby," is from 1540s in English. Danish and Swedish plump "rude, coarse, clumsy" are from the Low German word and represent a different sense development. Middle English plump (n.) "a compact group of people, a crowd" (c. 1400) perhaps is from Middle Dutch as well.

plump (v.1)

c. 1300, "to fall (into water) or strike with a full impact," a common Low German word, from or related to Middle Dutch and Dutch plompen, East Frisian plumpen, Middle Low German plumpen, probably more or less imitative of something hard striking something soft. Perhaps influenced by or merged with Middle English plumben "immerse (in liquid)," late 14c., from plumb (n.) in the "weight" sense. Hence plump (n.) "a firm blow," in pugilism usually one to the belly.

To plump; to strike, or shoot. I'll give you a plump in the bread basket, or the victualling office; I'll give you a blow in the stomach. [Grose, "Dictionary of the Vulgar Tongue," London, 1785]

Or, even if any of them should suspect me, I know how to bring myself off. It is but pretending to be affronted, stripping directly, challenging him to fight, and before he can be on his guard, hitting him a plump in the bread-basket, that shall make him throw up his accounts; and I'll engage he will have but very little stomach to accuse me after. ["The Reverie: or A Flight to the Paradise of Fools," London, 1763]

As an adverb, "at once," as in a sudden fall, from 1590s.

plump (v.2)

1530s, "to become plump," from plump (adj.). Transitive meaning "to plump (something) up, to cause to swell" is from 1530s. Related: Plumped; plumping.

updated on July 17, 2020

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Definitions of plump from WordNet
1
plump (v.)
drop sharply;
Synonyms: plummet
plump (v.)
set (something or oneself) down with or as if with a noise;
Synonyms: plank / flump / plonk / plop / plunk / plump down / plunk down
plump (v.)
make fat or plump;
We will plump out that poor starving child
Synonyms: fatten / fat / flesh out / fill out / plump out / fatten out / fatten up
plump (v.)
give support (to) or make a choice (of) one out of a group or number;
I plumped for the losing candidates
Synonyms: go
2
plump (n.)
the sound of a sudden heavy fall;
3
plump (adv.)
straight down especially heavily or abruptly;
the anchor fell plump into the sea
we dropped the rock plump into the water
4
plump (adj.)
sufficiently fat so as to have a pleasing fullness of figure;
pleasingly plump
Synonyms: chubby / embonpoint
From wordnet.princeton.edu, not affiliated with etymonline.