Something sticking out from a surface; a swelling, protuberant part; a bending outward, especially when caused by pressure.

“a bulge in a wall”

The bilge or protuberant part of a cask.

The bilge of a vessel.

To stick out from (a surface).

“He stood six feet tall, with muscular arms bulging out of his black T-shirt.”

To bilge, as a ship; to founder.