blue-on-blue

剑桥词典

relating to an attack in which soldiers , etc. are injured or killed by their own army or by soldiers on the same side as them
（战争中）误伤己方的
The number of blue-on-blue deaths has risen steadily during the present campaign . 在正在进行的战役中，因为己方误伤而导致死亡的人数直线上升。
比较
friendly fire 返回 blue-on-blue