belly

(noun) the region of the body of a vertebrate between the thorax and the pelvis. Synonyms: abdomen, venter, stomach.

(noun) a protruding abdomen. Synonyms: paunch.

(noun) a part that bulges deeply. Example: "The belly of a sail."

(noun) the hollow inside of something. Example: "In the belly of the ship."

(noun) the underpart of the body of certain vertebrates such as snakes or fish.

(verb) swell out or bulge out. Synonyms: belly out.