sister-in-law
definitions
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noun
A woman who is related to you by marriage; specifically, the sister of one's spouse, the wife of one's sibling, or the wife of one's spouse's sibling.de: Schwägerin
examples
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He asked around and found out that his brother was killed by his sister-in-law and her lover.
Er erkundigte sich herum und fand heraus, dass sein Bruder von seiner Schwägerin und deren Liebhaber getötet wurde.