Dictionary

blood brother

noun

: a man or boy who has promised to be loyal to another man or boy usually in a ceremony in which they mix their blood

Full Definition of BLOOD BROTHER

1
:  a brother by birth
2
:  one of two men pledged to mutual loyalty by a ceremonial use of each other's blood
blood brotherhood noun

Examples of BLOOD BROTHER

  1. He would never betray me—he's my blood brother.

First Known Use of BLOOD BROTHER

1799

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