to hire oneself out; to become a soldier for a wage (see Molina)
Alonso de Molina:
ihitoa. nin. (pret. oninihito.) alquilarse, o entrar a soldada. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 36v. col. 1. Thanks to Joe Campbell for providing the transcription.