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Definition of brother-in-law noun from the Oxford Advanced Learner's Dictionary

brother-in-law

noun
 
/ˈbrʌðər ɪn lɔː/
 
/ˈbrʌðər ɪn lɔː/
(plural brothers-in-law)
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  1. the brother of your husband or wife; your sister’s or brother's husband; the husband of your husband's or wife’s sister or brother compare sister-in-lawTopics Family and relationshipsb1
See brother-in-law in the Oxford Advanced American Dictionary
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