ixtia.

Headword: 
ixtia.
Principal English Translation: 

to keep watch, to observe; to face someone (see Karttunen)

IPAspelling: 
iːʃtiɑː
Alonso de Molina: 

ixtia. nin. (pret. oninixti.) advertir y mirar diligentemente.
ixtia. nin. (pret. oninixti.) atalayar o asechar.
ixtia. nite. (pret. oniteixti.) hacer rostro a los enemigos.
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.

Frances Karttunen: 

ĪXTIĀ vrefl, vt to keep watch, to observe; to face someone / atalayar o asechar (M) advertir y mirar diligentemente (M), hacer rostro a los enemigos (M), se asoma (T)[(3)Tp.143]. See ĪX-TLI.

ĪXTĪLŌ nonact. ĪXTIĀ
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 120.

Attestations from sources in English: 

ixtia = to face a person, especially the enemy; to watch
Daniel Garrison Brinton, Ancient Nahuatl Poetry: Containing the Nahuatl Text of XXVII Ancient Mexican Poems (1887), 156.