Simple Definition of brother–in–law
: the brother of your husband or wife
: the husband of your sister
Full Definition of brother–in–law
plural broth·ers–in–law play \ˈbrə-thərz-ən-\
1 : the brother of one's spouse
2 a : the husband of one's sister b : the husband of one's spouse's sister
First Known Use of brother–in–law
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Spanish Central: Translation of "brother–in–law"
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