The correct spelling of "more two ton" is actually "mortal sin". The confusion may arise because of the similar sounds present in both phrases. The phonetic transcription of "mortal sin" is /ˈmɔːrtl sɪn/, where the first syllable is pronounced with an "aw" sound (as in "law") and the second syllable has a short "i" sound (as in "sit"). It's important to pay attention to the context in which a phrase is used to ensure accurate spelling and pronunciation.