to make knots; for a cane or an herb to become knotted or intertwined (see Molina)
IPAspelling:
iːʃtiɑ
Alonso de Molina:
ixtia. nitla. (pret. onitlaixti.) hazer ñudos.
ixtia m. (pret. omixti.) hazer ñudo la caña o la yerua. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 47v. col. 2. Thanks to Joe Campbell for providing the transcription.