to become unraveled (speaking of the edge of piece of clothing) (see Molina)
IPAspelling:
teːnʃitini
Alonso de Molina:
tenxitini. (pret. otenxitin.) deshilarse la orilla dela vestidura. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 100r. col. 1. Thanks to Joe Campbell for providing the transcription.