Your belly is your stomach. If you have a belly ache, you have a pain in your abdomen.

Santa Claus is famous for his jolly laugh and his large belly. The word belly is a more casual way to say "stomach" or "abdomen," just as your navel is informally called a "belly button." A less common way to use the word is as a verb meaning "to swell," which is actually the oldest meaning of belly, from the Old English belig, "bag," and a Germanic root meaning "to swell like a bag."

Definitions of belly

n the region of the body of a vertebrate between the thorax and the pelvis

abdomen, stomach, venter
underbelly, underbody
the soft belly or underside of an animal's body
Type of:
body part
any part of an organism such as an organ or extremity

n the underpart of the body of certain vertebrates such as snakes or fish

Type of:
a part lying on the lower side or underneath an animal's body

n a protruding abdomen

bay window, corporation, pot, potbelly, tummy
slang for a paunch
Type of:
adipose tissue, fat, fatty tissue
a kind of body tissue containing stored fat that serves as a source of energy; it also cushions and insulates vital organs

n a part that bulges deeply

“the belly of a sail”
Type of:
bulge, bump, excrescence, extrusion, gibbosity, gibbousness, hump, jut, prominence, protrusion, protuberance, swelling
something that bulges out or is protuberant or projects from its surroundings

n the hollow inside of something

“in the belly of the ship”
Type of:
inside, interior
the inner or enclosed surface of something

v swell out or bulge out

belly out
Type of:
intumesce, swell, swell up, tumefy, tumesce
expand abnormally

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