Quick definitions from WordNet (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:  drop sharply
▸ 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
▸ adjective:  euphemisms for slightly fat ("Pleasingly plump")
▸ adverb:  straight down especially heavily or abruptly ("The anchor fell plump into the sea")
▸ name:  A surname (very rare: popularity rank in the U.S.: #21326)

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▸ Also see plump