blue-on-blue

World English Dictionary
blue-on-blue
 
adj
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 & Unabridged 10th Edition
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Main Entry:  blue-on-blue
Part of Speech:  n
Definition:  an instance of friendly military forces engaging other friendly forces in warfare
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