ipotza. nin. (pret. oninipotz.) regoldar. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 42r. col. 1. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
IHPŌTZ(A) vrefl to belch / regoldar (M), eructa (Z) [(3)Tp.141, (2)Zp.54,170]. T has E for I. X has ILPŌTZ(A). See PŌTZ(A).
IHPŌTZALŌ nonact. IHPŌTZ(A)
EHPŌTZ(A) See IHPŌTZ(A). Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 99.