Co-sister-in-law meaning

One's brother-in-law or sister-in-law's sister; that is, one's sibling's spouse's sister (one's sister's husband's sister or one's brother's wife's sister).
  • (in the plural) The relationship between women whose brother and sister are married to each other.
noun
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One's husband's brother's wife; or more generally one's spouse's sister-in-law, the sister of one spouse in relation to the siblings of the other spouse.
  • (in the plural) The relationship between women who marry brothers.
noun
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Origin of co-sister-in-law