Meaning of the word "comrade in arms" in English

What does "comrade in arms" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

comrade in arms

US /ˈkɑm.reɪd ɪn ɑrmz/
UK /ˈkɒm.reɪd ɪn ɑːmz/

Phrase

a person who has fought alongside another in a war; a close companion or ally in a struggle

Example:
He met his old comrade in arms at the veterans' reunion.
We were comrades in arms during the difficult project.