—n. 1. the front or under part of a vertebrate body from the breastbone to the pelvis, containing the abdominal viscera; the abdomen.
2. the stomach with its adjuncts.
3. appetite or capacity for food; gluttony.
4. the womb.
5. the inside or interior of anything: the belly of a ship. 6. a protuberant or bulging surface of anything: the belly of a flask. 7. Anat.the fleshy part of a muscle.
8. the front, inner, or under surface or part, as distinguished from the back.
9. the front surface of a violin or similar instrument.
10. a bulge on a vertical surface of fresh concrete.
11. the underpart of the fuselage of an airplane.
—v.t. to fill out; swell: Wind bellied the sails.
—v.i. 1. to swell out: Sails bellying in the wind. 2. to crawl on one's belly: soldiers bellying through a rice paddy. 3. belly up to,Informal. a. to approach closely, esp. until one is in physical contact: to belly up to a bar. b. to curry favor from: Would you have gotten the promotion if you hadn't bellied up to the boss? 4. go or turn belly up,Informal.to come to an end; die; fail: After years of barely surviving on donations, the neighborhood social club finally went belly up.