Brother-in-arms

n. kind, resilient warm

What it means

A loyal companion who has faced military service or severe hardship alongside another.

Reach for it when honoring solidarity formed through shared danger

He welcomed his former brother-in-arms with a long quiet embrace.

Words to choose between 6

By register, from playful at the top to literary at the bottom. Tap a word to see when it fits.
everyday
warm
  • Brother-in-arms (this word)
professional
formal
literary
  • everyday

    old service friend

    Fits when plain language should center lasting friendship after service

    Careful The phrase does not convey the intensity of danger faced together.

  • professional

    ally

    Fits when cooperation toward the same goal matters more than closeness

    Careful An ally may be strategic, temporary, or institution-level.

  • professional

    fellow soldier

    Fits when shared military role is the only verified fact

    Careful Fellow soldier does not imply friendship or shared danger.

  • formal

    comrade

    Fits when shared struggle and solidarity define the relationship

    Careful Comrade carries political associations and need not involve military service.

  • formal

    comrade-in-arms

    Fits when the military bond should be stated precisely

    Careful The phrase is nearly equivalent and offers no warmer personal nuance.

  • literary

    battle companion

    Fits when personal companionship during combat is central

    Careful The phrase is dramatic and unsuitable for nonmilitary hardship.

Opposites 3

  • enemy
  • adversary
  • deserter

Common phrases 3

  • former brother-in-arms

    A former brother-in-arms spoke at the memorial.

  • fallen brother-in-arms

    They planted an oak for each fallen brother-in-arms.

  • loyal brother-in-arms

    His loyal brother-in-arms kept writing throughout the recovery.

Usage notes

Keep in mind

Brother-in-arms is gendered and military. Comrade-in-arms or a plain description may be more inclusive where identity matters.

Definitions and examples are written for this site. How words are chosen Recording: Vealhurl, Southern England accent, from Wikimedia Commons, CC BY-SA 4.0 Updated