depth bomb

WordReference Random House Learner's Dictionary of American English © 2026

ˈdepth ˌcharge, n. [countable]

1. Military an explosive device used underwater, esp. against submarines, and set to go off at a certain depth. Also called ˈdepth ˌbomb. 

WordReference Random House Unabridged Dictionary of American English © 2026

depth′ charge′, 

1. Military an explosive device that is used against submarines and other underwater targets, and is usually set to detonate at a predetermined depth. Also called depth′ bomb′. 

• 1915–20

Collins Concise English Dictionary © HarperCollins Publishers::

depth charge, depth bomb noun

1. a bomb used to attack submarines that explodes at a pre-set depth of water