Meaning of “mortal sin” in the English Dictionary

british dictionary

"mortal sin" in British English

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mortal sinnoun [ C usually singular ]

uk /ˌmɔː.təl ˈsɪn/ us /ˌmɔːr.t̬əl ˈsɪn/

(Definition of “mortal sin” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)