CHICHIY(A) pret: CHICHIX ~ CHICHĪX to become sour, bitter / acedarse algo, o tornarse amargo (M) The alternating vowel length in the preterit is not attested but is based on analogy with other verbs in IY(A). See CHICHIC. Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 49.