Merriam-Webster's Collegiate® Dictionary, 11th Edition
BELLY
I. noun (plural bellies) see: blow Date: before 12th century
1. abdomen 1, the stomach and its adjuncts, the undersurface of an animal's body, womb , uterus , an internal cavity ; interior , appetite for food, a surface or object curved or rounded like a human belly,
5. the enlarged fleshy body of a muscle, the part of a sail that swells out when filled with wind, gut 1a(2),
II. verb (bellied; bellying)
Date: 1606
transitive verb to cause to swell or fill out , intransitive verb swell , fill ,
2. to slide or crawl on one's belly, belly-land