WordWeb Online

1. Make fat or plump
   - fatten, fat [archaic], fill out, plump, plump out, fatten out, fatten up
    
2. Describe and explain in detail
   - elaborate, lucubrate [archaic], expatiate, exposit, enlarge, expand, expound, dilate
    
3. Become round, plump, or shapely
   "The young woman is fleshing out";
   - round, fill out

Derived forms: fleshed out, fleshes out, fleshing out

Type of: alter, change, clarify, clear up, elucidate, gain, modify, put on