WordNet (r) 3.0 (2006):

flesh out
    v 1: 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]
    2: add details, as to an account or idea; clarify the meaning of
       and discourse in a learned way, usually in writing; "She
       elaborated on the main ideas in her dissertation" [syn:
       elaborate, lucubrate, expatiate, exposit, enlarge,
       flesh out, expand, expound, dilate] [ant:
       abbreviate, abridge, contract, cut, foreshorten,
       reduce, shorten]
    3: become round, plump, or shapely; "The young woman is fleshing
       out" [syn: round, flesh out, fill out]