The lower fuselage of an airplane.
The stomach.
The main curved portion of a knife blade.
The abdomen, especially a fat one.
The part of anything which resembles (either closely or abstractly) the human belly in protuberance or in concavity; often, the fundus (innermost part).
The womb.
The hollow part of a curved or bent timber, the convex part of which is the back.
To swell and become protuberant; to bulge or billow.
To cause to swell out; to fill.
To position one’s belly; to move on one’s belly.
The start of the landing area of a runway.
The outset of something; the point of entry, or the beginning of an action.
The bottom-most part of a doorway that one crosses to enter; a sill.
The point where one mentally or physically is vulnerable in response to provocation or to particular things in general. As in emotions, stress, or pain.
An entrance; the door or gate of a house.
The quantitative point at which an action is triggered, especially a lower limit.
Any end or boundary.
The wage or salary at which income tax becomes due.