(1):

(v. i.) To swell or jut out; to bend outward, as a wall when it yields to pressure; to be protuberant; as, the wall bulges.

(2):

(n.) The bilge of a vessel. See Bilge, 2.

(3):

(n.) The bilge or protuberant part of a cask.

(4):

(v. i.) To bilge, as a ship; to founder.

(5):

(n.) A swelling, protuberant part; a bending outward, esp. when caused by pressure; as, a bulge in a wall.