The abdomen, especially a fat one.
The stomach.
The womb.
The lower fuselage of an airplane.
The part of something that resembles the human belly in either protrusion or concavity, such as the main curved portion of a knife blade or the hollow part of a curved timber.
To position one’s belly; to move on one’s belly.
(intransitive) To swell and become protuberant; to bulge or billow.
(transitive) To cause to swell out; to fill.