Rashi on Leviticus 20:23/רש"י על ויקרא כ׳:כ״ג

1קוץ — ואקץ signifies loathsomeness. Similar is: (Genesis 27:46) "I am sick (קצתי) of my life”, like a man who is disgusted with his food (Sifra, Kedoshim, Chapter 12 16).