to become certified or to try and understand a business (see Molina)
Alonso de Molina:
yollo macitiuh. no. (pret. onoyollo macitia.) certificarse oyr calando y entendiendo algun negocio. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 40r. col. 2. Thanks to Joe Campbell for providing the transcription.