plump

nouns

the sound of a sudden heavy fall
is a type of (narrower)
sound of any kind (especially unintelligible or dissonant sound)
"he enjoyed the street noises"; "they heard indistinct noises of people talking"; "during the firework display that ended the gala the noise reached 98 decibels"

verbs

drop sharply
"The stock market plummeted"
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"
make fat or plump
"We will plump out that poor starving child"
give support (to) or make a choice (of) one out of a group or number
"I plumped for the losing candidates"

adjectives

sufficiently fat so as to have a pleasing fullness of figure
"a chubby child"; "pleasingly plump";
is derived from

adverbs

straight down especially heavily or abruptly
"the anchor fell plump into the sea"; "we dropped the rock plump into the water"
domain usage
a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech