Etymology

co-brother

Today it means: One's colleague ("brother" in the same craft, occupation, or society). Full definition →

English brother ← Middle English brother ← Old English brōþor
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The story

  1. Englishco-
  2. Proto-Indo-European*bʰréh₂tēr
  3. Proto-Germanic*brōþēr
  4. Proto-West Germanic*brōþer
  5. Old Englishbrōþor
  6. Middle Englishbrother
  7. Englishbrother
  8. English todayco-brother

From co- + brother.

Etymology from Wiktionary, CC BY-SA 4.0.