mortal sin
noun/ˌmɔːtl ˈsɪn/
/ˌmɔːrtl ˈsɪn/
[countable, uncountable]- (in the Roman Catholic Church) a very serious sin for which you can be sent to hell unless you confess and are forgiven
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mortal sin
Definition of mortal sin noun from the Oxford Advanced Learner's Dictionary
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