depth charge

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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
depth charge or depth bomb
a bomb used to attack submarines that explodes at a pre-set depth of water
depth bomb or depth bomb

Collins English Dictionary - Complete & Unabridged 10th Edition
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