a state of freezing to death, or to be suffering from cold sweats and fever (see Molina)
IPAspelling:
tetsilkiːsɑlistɬi
Alonso de Molina:
tetzilquizaliztli. aterimiento tal. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 111r. col. 2. Thanks to Joe Campbell for providing the transcription.