to shudder and become scared by thunder, or of some great sudden noise; to make someone shudder and become scared with a great noise (see Molina)
Orthographic Variants:
tlac yzauia
Alonso de Molina:
tlac yzauia. nino. (pret. oninotlacyzaui.) estremecerse todo el cuerpo y espantarse del trueno, o de algun gran estruendo subito.
tlac yzauia. nite. (pret. onitetlacyzaui.) hazer estremecer a otro desta manera. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 117v. col. 2. Thanks to Joe Campbell for providing the transcription.