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friendly fire

American  

noun

  1. Insurance. a fire deliberately set and remaining contained, as in a fireplace or boiler, from which any resulting loss cannot be claimed as an insurance liability (opposed to hostile fire).

  2. (in military combat) fire, as by artillery, by one's own forces, especially when causing damage near or casualties to one's own troops.


friendly fire British  

noun

  1. military firing by one's own side, esp when it harms one's own personnel

"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

Example Sentences

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However, maintaining that heightened state of readiness may also increase the chance of immune "friendly fire," in which the body mistakenly attacks its own healthy tissues and triggers autoimmune disease.

From Science Daily Aug. 20, 2026

They include six aboard a refuelling aircraft that crashed in Iraq, an incident US officials said was not the result of hostile or friendly fire.

From Barron's Mar. 15, 2026

Central Command said the crash wasn’t due to hostile or friendly fire, and a second KC-135 involved in the incident landed safely.

From The Wall Street Journal Mar. 13, 2026

Earlier this month, three F-15s were shot down in "an apparent friendly fire incident" over Kuwait, officials said.

From BBC Mar. 13, 2026

Other code talkers died in battle before the end of the war, but Harry Tsosie was the only one killed by friendly fire.

From "Code Talker: A Novel About the Navajo Marines of World War Two" by Joseph Bruchac

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