brother-in-arms
brother-in-arms — noun
1. someone you trust deeply because you have faced war, danger, or a hard struggle
someone you trust deeply because you have faced war, danger, or a hard struggle on the same side.
After the war, Wei still met his old brothers-in-arms every spring.
plural form: brothers-in-arms
The two firefighters became brothers-in-arms after the factory rescue last winter.
become brothers-in-arms through shared danger
Michael wrote to a former brother-in-arms who now lived in Seoul.
Sirin called the union organizers brothers-in-arms during the long pay dispute.
To the old captain, every medic from that mission was a brother-in-arms.
文法句型
a brother-in-arms
brothers-in-arms
用法筆記
Usually used for people who have been on the same side in war, danger, or a long campaign. It can also be used figuratively for people united by a difficult cause, but it sounds more intense than ordinary 'friend' or 'colleague'.