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English definition of “brother-in-law”

brother-in-law

noun [C]     /ˈbrʌð.ə.rɪn.lɔː/ US  /-ɚ.ɪn.lɑː/ (plural brothers-in-law)
B2 the husband of your sister or brother, or the brother of your husband or wife, or the man who is married to the sister or brother of your wife or husbandNon-blood relations
(Definition of brother-in-law noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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