to warn someone about what he or she should do, what is in his or her best interests to do
Alonso de Molina:
icnixonexca ic nitlamatzoa. (pret. ic onixonexcac.) advertir a otro paraque ande sobre aviso en lo que le conviene. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 33r. col. 1. Thanks to Joe Campbell for providing the transcription.