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English definition of “sister-in-law”

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sister-in-law

noun [C] uk   /ˈsɪs.tə.rɪn.lɔː/ us    /-tɚ.ɪn.lɑː/ ( plural sisters-in-law)
B2 the wife of your brother or sister, or the sister of your husband or wife, or the wife of the brother or sister of your husband or wife
(Definition of sister-in-law from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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