plump in WordNet English dictionary

1. sufficiently fat so as to have a pleasing fullness of figure
   "a chubby child"; "pleasingly plump";
   chubby  embonpoint  plump 
   

1. make fat or plump
   "We will plump out that poor starving child"
   fatten  fat  flesh out  fill out  plump  plump out  fatten out  fatten up 
   
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"
   plank  flump  plonk  plop  plunk  plump down  plunk down  plump 
   
3. give support (to) or make a choice (of) one out of a group or number
   "I plumped for the losing candidates"
   plump  go 
   
4. drop sharply
   "The stock market plummeted"
   plummet  plump 
   

1. the sound of a sudden heavy fall
   plump 
   

1. straight down especially heavily or abruptly
   "the anchor fell plump into the sea"; "we dropped the rock plump into the water"
   plump  plump