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blood brother

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noun

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 performance of a specific ritual, as the commingling of blood.

Origin of blood brother

Middle English word dating back to 1350–1400
Related formsblood brotherhood, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for blood brother

brother, bro

Examples from the Web for blood brother

Historical Examples of blood brother

  • And how I've given you the love of a blood-brother to take the place of the brother who died?

  • What am I to do when a blood-brother is on the point of killing a cow?

    Indian Home Rule

    M. K. Gandhi

  • Something—the blood-brother of death—had been here on this planet, that much was certain.

    Thompson's Cat

    Robert Moore Williams

  • Though he were the King's blood-brother, he should tell for naught.

    The Ward of King Canute

    Ottilie A. Liljencrantz

  • Herein he is as unaccountable as the gray wolf, who is his blood-brother.

    Life's Handicap

    Rudyard Kipling

British Dictionary definitions for blood brother

blood brother

noun

a brother by birth
a man or boy who has sworn to treat another as his brother, often in a ceremony in which their blood is mingled
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012