tzopeliya.

Headword: 
tzopeliya.
Principal English Translation: 

to become sweet (see Karttunen)

Orthographic Variants: 
tzopēliya
IPAspelling: 
tsopeːliyɑ
Frances Karttunen: 

TZOPĒLIY(A) pret: TZOPĒLĪX ~ TZOPĒLIYAC to become sweet / endulcecerse (M) [(3)Cf.32r]. This contrasts with transitive TZOPĒLIĀ ‘to sweeten something.’
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 319.