to get in the way or impede something bad from happening (see Molina); Molina refers to "he who" does this, as though this is a noun and not a verb (SW)
Alonso de Molina:
tetlatzacuilia. el que impide y estorua algun mal. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 110r. col. 1. Thanks to Joe Campbell for providing the transcription.