ixcuepa.

Headword: 
ixcuepa.
Principal English Translation: 

to turn the face away (literal meaning); to turn right side out (speaking of clothing); to deceive; to err on the road (see Molina)

IPAspelling: 
iːʃkwepɑ
Alonso de Molina: 

ixcuepa. nin. (pret. oninixcuep.) herrar el camino, o andar descarriado.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 45r. col. 2. Thanks to Joe Campbell for providing the transcription.

ixcuepa. nite. (pret. oniteixcuep.) embaucar o engañar a otro.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 45r. col. 2. Thanks to Joe Campbell for providing the transcription.

ixcuepa. nitla. (pret. onitlaixcuep.) boluer lo de dentro a fuera. s. la ropa.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 45r. col. 2. Thanks to Joe Campbell for providing the transcription.

Frances Karttunen: 

ĪXCUEP(A) vrefl, vt to lose one’s way and get confused; to deceive someone, to turn something inside out or upside down / errar el camino o andar descarriado (M), embaucar o engañar a otro (M) volver lo de adentro a fuera (M), lo trabuca, lo pone boca arriba, le tiene dos caras (T) See ĪX-TLI, CUEP(A).
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 113.

Attestations from sources in English: 

ixcuepa = to deceive (mo-; to be wrong)Michel Launey, An Introduction to Classical Nahuatl, translated and adapted by Christopher MacKay (Cambridge: Cambridge University Press, 2011), 175.

yn teyxcuepanime yn diablosme yn intlayacacahuan yn yztlacati yn titiçi = enchanters, devils and their leaders, those who lie, the fortune-telling medical practitioners (Central Mexico, 1552)
Fray Alonso de Molina, Nahua Confraternities in Early Colonial Mexico: The 1552 Nahuatl Ordinances of fray Alonso de Molina, OFM, ed. and trans., Barry D. Sell (Berkeley: Academy of American Franciscan History, 2002), 84–85.