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
adverb: straight down especially heavily or abruptly
"The anchor fell plump into the sea."