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Definition of blood brother noun from the Oxford Advanced Learner's Dictionary

blood brother

noun
 
/ˈblʌd brʌðə(r)/
 
/ˈblʌd brʌðər/
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  1. a man who has promised to treat another man as his brother, usually in a ceremony in which their blood is mixed together
See blood brother in the Oxford Advanced American Dictionary
previously
adverb
 
 
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