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Definition of Co-brother-in-law
1. Noun. (uncommon) One's wife's sister's husband; or more generally one's spouse's brother-in-law, the brother of one spouse in relation to the siblings of the other spouse. ¹
2. Noun. (uncommon) One's brother-in-law or sister-in-law's brother; that is, one's sibling's spouse's brother (one's sister's husband's brother or one's brother's wife's brother). ¹
¹ Source: wiktionary.com