xixitini.

Headword: 
xixitini.
Principal English Translation: 

to crumble or fall (such as a wall or a mountain) (see Molina)

IPAspelling: 
ʃihʃitiːni
Alonso de Molina: 

xixitini. (pret. oxixitin.) deshazerse, o caerse pared, o sierra.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 160r. col. 1. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in English: 

auh in calli tzitzintla cacic auh capapachiuh xixitin in calli = it reached the lower parts of the houses; and, wet by the water, the houses crumbled. (central Mexico, sixteenth century)
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 8 -- Kings and Lords, no. 14, Part IX, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1951), 18.