Definition of "Plump" :

noun: the sound of a sudden heavy fall

verb: give support (to) or make a choice (of) one out of a group or number

"I plumped for the losing candidates."

verb: make fat or plump

"We will plump out that poor starving child."

verb: set (something or oneself) down with or as if with a noise

verb: drop sharply

adjective: sufficiently fat so as to have a pleasing fullness of figure

"Pleasingly plump."

adverb: straight down especially heavily or abruptly

"The anchor fell plump into the sea."