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English definition of “brother-in-law”

brother-in-law

noun [C]  /ˈbrʌð·ər·ənˌlɔ/ (plural brothers-in-law  /ˈbrʌð·ərz·ənˌlɔ/) us  
the husband of someone’s sister, or the brother of someone’s wife or husband, or the husband of the sister of someone’s wife or husband
(Definition of brother-in-law from the Cambridge Academic Content Dictionary © Cambridge University Press)
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