blue-on-blue


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blue-on-blue

adj
(Firearms, Gunnery, Ordnance & Artillery) military of or relating to friendly fire: blue-on-blue contacts.
[C20: from the colour used to mark a country's own troops and allies on a military map]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014