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Discharge of a military weapon that injures or kills a member of one's own armed forces or an ally.
(Military) military firing by one's own side, esp when it harms one's own personnel
fire, as by artillery, by one's own forces, that causes casualties to one's own troops.
In casualty reporting, a casualty circumstance applicable to persons killed in action or wounded in action mistakenly or accidentally by friendly forces actively engaged with the enemy, who are directing fire at a hostile force or what is thought to be a hostile force. See also casualty.