The spelling of "gotten worst it" can be explained using the International Phonetic Alphabet (IPA). In American English, the word "gotten" is pronounced as "got-n" with a silent "e". "Worst" is pronounced as "wurst" with an "o" sound as in "hot". "It" is pronounced as "it" with a short "i" sound. Therefore, the correct spelling of the phrase is "gotten worst it", not "gotten worse it". This demonstrates the importance of understanding pronunciation when spelling words.