The correct spelling of the phrase "more mellowing" is /mɔːr ˈmɛləʊɪŋ/ with the stress on the second syllable of "mellowing". The word "mellowing" is derived from the verb "mellow", which means to soften or become more relaxed with time. In this context, "more mellowing" means becoming even more relaxed or calmer. Proper spelling is essential for clear communication, so using the right spelling and pronunciation of words like "mellowing" ensures better understanding between people.