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collateral damage

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noun
  1. the killing of civilians in a military attack.
  2. any damage incidental to an activity.
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Origin of collateral damage

First recorded in 1985–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for collateral damage

collateral damage

noun
  1. military unintentional damage to civil property and civilian casualties, caused by military operations
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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

Word Origin and History for collateral damage

n.

by 1873 in legal cases; in modern use, generally a euphemism for "the coincidental killing of civilians," U.S. coinage, c.1968, at first generally with reference to nuclear weapons.

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Online Etymology Dictionary, © 2010 Douglas Harper