the edge or the sharpness of a knife, and the like
Alonso de Molina:
tenitzticayotl. filo, o agudeza de cuchillo. &c. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 99r. col. 2. Thanks to Joe Campbell for providing the transcription.