Co-sister-in-law
"Co-sister-in-law" in a Sentence (2 examples)
[The Russian word] Yátrov', for the husband's brother's wife or co-sister-in-law, so diagnostic a status within the patrilocal household, has passed entirely out of the language.
At first the wench's second co-sister-in-law and the middle sister-in-law got into it.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.