blood-brother
n man who has sworn to treat another man as his brother, usu in a ceremony in which their blood is mixed together 盟兄弟, 把兄弟（通常指歃血为盟的）.
n man who has sworn to treat another man as his brother, usu in a ceremony in which their blood is mixed together 盟兄弟, 把兄弟（通常指歃血为盟的）.
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