society > travel > travel by water > vessel, ship, or boat > parts of vessels > body of vessel > [noun] > bulge to give protection or stability (2)
Nautical colloquial. An outer covering fitted to a vessel to provide protection against torpedoes and mines or to improve stability. Hence, a…
A protuberance on the hull of a ship to increase stability or to protect against under-water attack (cf. blister, n.1 2c).