From WordNet (r) 3.0 (2006):
plump
adv 1: straight down especially heavily or abruptly; "the anchor
fell plump into the sea"; "we dropped the rock plump into
the water"
adj 1: sufficiently fat so as to have a pleasing fullness of
figure; "a chubby child"; "pleasingly plump"; [syn:
chubby, embonpoint, plump]
n 1: the sound of a sudden heavy fall
v 1: drop sharply; "The stock market plummeted" [syn: plummet,
plump]
2: set (something or oneself) down with or as if with a noise;
"He planked the money on the table"; "He planked himself into
the sofa" [syn: plank, flump, plonk, plop, plunk,
plump down, plunk down, plump]
3: make fat or plump; "We will plump out that poor starving
child" [syn: fatten, fat, flesh out, fill out,
plump, plump out, fatten out, fatten up]
4: give support (to) or make a choice (of) one out of a group or
number; "I plumped for the losing candidates" [syn: plump,
go]