to go straight; to follow the straight road; to live right(?) (see Molina)
Alonso de Molina:
melauhtiuh. nitla. yr camino derecho. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 55r. col. 2. Thanks to Joe Campbell for providing the transcription.