tzoncui. nino. (pret. oninotzoncuic.) vengarse. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 153r. col. 2. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
TZONCUI vrefl to avenge oneself, to take vengeance / vengarse (M) [(1)Cf.96v]. See TZON-TLI, CUI. Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 317.