the act of giving consent or granting something with a nod or bowing of the head
IPAspelling:
iːʃtɬɑhtolistɬi
Alonso de Molina:
ixtlatoliztli. consentimiento tal. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 48r. col. 2. Thanks to Joe Campbell for providing the transcription.