English - English
Definition of co-sister-in-law in English English dictionary
- 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 plural The relationship between women whose brother and sister are married to each other.
- 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 plural The relationship between women who marry brothers.