Simple Definition of sister–in–law
: the sister of your husband or wife
: the wife of your brother
Full Definition of sister–in–law
plural sis·ters–in–law play \-tər-zən-\
1 : the sister of one's spouse
2a : the wife of one's brotherb : the wife of one's spouse's brother
First Known Use of sister–in–law
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Spanish Central: Translation of "sister–in–law"
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