zo. nino. (pret. oninozoc). sangrarse. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 24v. col. 2. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
ZŌ vrefl, vt; pret: ZŌC to pierce oneself; to draw blood by piercing someone / sangrarse (M), punzar y sangrar (C), pinchar, sangrar a alguien (S). Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 347.