BLOOD BROTHER

Definition:

1. [noun] a male with the same parents as someone else; "my brother still lives with our parents"
   Synonyms: brother
   
   
2. [noun] a male sworn (usually by a ceremony involving the mingling of blood) to treat another as his brother
   
   

Synonyms:

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Related Words:

• big brother
• little brother
• stepbrother, half-brother