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blood brother

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noun
  1. a person's brother by birth.
  2. a male person bound to another by ties of great friendship.
  3. something usually associated with or thought to exist inseparably from another thing, quality, circumstance, etc.: Humility is often the blood brother of patience.
  4. a male established in a close relationship with another male through the performance of a specific ritual, as the commingling of blood.
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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. 2018

Examples from the Web for blood brother

Historical Examples

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

    Riders of the Silences

    John Frederick

  • 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
  1. a brother by birth
  2. a man or boy who has sworn to treat another as his brother, often in a ceremony in which their blood is mingled
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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