mauhcatzatzi. ni. (pret. onimauhcatzatzic.) gritar de miedo. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 54r. col. 1. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
MAUHCĀTZAHTZI to cry out in fear / grita de espanto (T) [(3)Tp. 140]. See MAHU(I), TZAHTZI.
MAUHCĀTZAHTZĪTIĀ caus. MAUHCĀTZAHTZI Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 140.