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mortal sin

noun
🔊/ˌmɔːtl ˈsɪn/
🔊/ˌmɔːrtl ˈsɪn/
 [countable, uncountable]
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  1. (in the Roman Catholic Church天主教) a very serious sin for which you can be sent to hell unless you confess and are forgiven死罪；大罪Topics Religion and festivalsc2