blood brother

Definitions of blood brother
  1. noun
    a male with the same parents as someone else
    synonyms: brother
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    sis, sister
    a female person who has the same parents as another person
    big brother
    an older brother
    little brother
    a younger brother
    half brother, half-brother, stepbrother
    a brother who has only one parent in common with you
    type of:
    male sibling
    a sibling who is male
  2. noun
    a male sworn (usually by a ceremony involving the mingling of blood) to treat another as his brother
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    type of:
    ally, friend
    an associate who provides cooperation or assistance
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