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blood brother
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Quick answer
As a noun, blood brother means a male with the same parents as someone else.
Meanings of blood brother
2 meaningsnoun
A male with the same parents as someone elseperson
“my brother still lives with our parents”
Similar: brotherA male sworn (usually by a ceremony involving the mingling of blood) to treat another as his brotherperson
Meanings from Wiktionary (CC BY-SA 4.0) and Open English WordNet (CC BY 4.0).
Synonyms by meaning
noun: a male with the same parents as someone else