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depth charge

noun
1.
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.
Origin
1915-1920
1915-20
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for depth bomb

depth charge

noun
1.
a bomb used to attack submarines that explodes at a pre-set depth of water
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Value for depth

11
11
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