someone exhausted or running out of breath because of much work or because of an illness (see Molina)
Alonso de Molina:
ihiocauhcaqui. desfallecido assi. 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.