
Blood brother can refer to one of two things: a male related by birth, or two or more men not related by birth who have sworn loyalty to each other. This is in modern times usually done in a ceremony, known as a blood oath, where having each person make a small cut, usually on a finger, hand or the forearm, and then the two cuts are pressed togeth...
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http://en.wikipedia.org/wiki/Blood_brother

[
n] - a male sworn (usually by a ceremony involving the mingling of blood) to treat another as his brother
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http://www.webdictionary.co.uk/definition.php?query=blood%20brother

a person's brother by birth. · a male person bound to another by ties of great friendship. · something usually associated with or thought to exist inseparably from another thing, quality, circumstance, etc.: Humility is often the blood brother of patience. · a male established in a close relationship with another male through the p...
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https://www.infoplease.com/dictionary/blood-brother
No exact match found.