to undo or undermine an argument made by someone (see Molina)
Alonso de Molina:
tlaxinilia. nite. (pret. onitetlaxinili.) deshazer, o desbaratar argumento o lo que otro dize. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 146r. col. 1. Thanks to Joe Campbell for providing the transcription.