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8 Wintry Words to Defrost Your Vocabulary

blue-on-blue

adjective
1.
(military) of or relating to friendly fire: blue-on-blue contacts
Word Origin
C20: from the colour used to mark a country's own troops and allies on a military map
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Contemporary definitions for blue-on-blue
noun

an instance of friendly military forces engaging other friendly forces in warfare

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