to realize something that was not understood before (see Molina)
Alonso de Molina:
ipan yauh noyollo (pret. ipan oya in noyollo) caer enla cuenta delo que no entendia. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 41v. col. 2. Thanks to Joe Campbell for providing the transcription.