sister in law

noun [ C ] uk / ˈsɪs. fire in his fingertips season 2 tə. parfum vip man in black rɪn lɔː / us / ˈsɪs tɚ ɪn lɑː / plural sisters-in-law Add to word list 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 Thesaurus: synonyms, antonyms, and examples