The phrase "more well nigh" is often misspelled as "more well-not". The correct spelling of "more well nigh" uses the IPA phonetic transcription to clarify the pronunciation. In IPA, the word "nigh" has the symbol /naɪ/, indicating a long "i" sound. The phrase "more well" should be pronounced with a short "o" sound, represented by /mɔr/ in IPA. Therefore, the correct pronunciation and spelling of the phrase is /mɔr wɛl naɪ/.