Noah Webster's New International Dictionary of the English Language

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

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

3. (n.) The bilge of a vessel. See Bilge.

4. (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.

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