to put horses out to pasture, to graze (see Molina)
Orthographic Variants:
mazatlaqualtia
Alonso de Molina:
mazatlaqualtia. ni. (pret. onimazatlaqualti.) pensar bestias. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 50r. col. 2. Thanks to Joe Campbell for providing the transcription.