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
See blood brother defined for English-language learners
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First Known Use of BLOOD BROTHER
1799
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