Definition of companion-in-arms in English:
A fellow soldier.
- Robert the Bruce is understood to have gifted the land to his companion-in-arms, Sir Alexander Seton.
- There he met his Brazilian-born wife Anita who became his companion-in-arms and heroine of the Risorgimento, and who fought side by side with her husband.
- On such considerations have I and my companions-in-arms acted in the course we have pursued.