The spelling of "hath aversion to" is interesting because "hath" is considered an archaic form of the verb "have." It is pronounced /hæθ/ in IPA phonetic transcription. "Aversion" is spelled as it sounds, with the stress on the second syllable, pronounced /əˈvɜrʒən/. Together, the phrase means having a strong dislike or distaste for something. While the language may have evolved, the meaning behind the words hasn't, and the phrase remains a useful way to express distaste or avoidance towards something.