Meaning

• The abdomen, especially a fat one.

• The stomach.

• The womb.

• The lower fuselage of an airplane.

• The part of anything which resembles the human belly in protuberance or in cavity; the innermost part.

  "the belly of a flask, muscle, violin, sail, or ship"

• The hollow part of a curved or bent timber, the convex part of which is the back.

Meaning

• To position one’s belly; to move on one’s belly.

• To swell and become protuberant; to bulge or billow.

• To cause to swell out; to fill.