Jisho

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Noun
1. brother-in-law; stepbrother; sworn brother
Wikipedia definition
2. Blood brotherBlood brother can refer to one of two things: two males related by birth, or two or more men not related by birth who have sworn loyalty to each other. This is usually done in a ceremony, known as a blood oath, where the blood of each man is mingled together. The process usually provides a participant with a heightened symbolic sense of attachment with another participant. Örvar-Oddr's saga contains a notable account of blood brotherhood.
Read “Blood brother” on English Wikipedia
Read “義兄弟” on Japanese Wikipedia
Read “Blood brother” on DBpedia

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