Wordnet 3.0
VERB (2)
1. 
 depart suddenly; 
- Example: "He plumped out of the house"2. 
 make fat or plump; 
- Example: "We will plump out that poor starving child"[syn: fatten, fat, flesh out, fill out, plump, plump out, fatten out, fatten up]
WordNet (r) 3.0 (2006):
plump out
    v 1: depart suddenly; "He plumped out of the house"
    2: make fat or plump; "We will plump out that poor starving
       child" [syn: fatten, fat, flesh out, fill out,
       plump, plump out, fatten out, fatten up]