brotherhood

noun
broth*er*hood \ ˈbrə-t͟hər-ˌhu̇d \
13th century{ds||1||}
  • the quality or state of being brothers
  • fellowship, alliance
  • an association (such as a labor union or monastic society) for a particular purpose

blood brother

noun
blood brother \
1799{ds||1||}
  • a brother by birth
  • one of two men pledged to mutual loyalty by a ceremonial use of each other's blood
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