oya.

ŌY(A) vt; pret: ŌX to shell something (corn, peas, etc.) / desgranar (C) T has a reduplicated form that loses the Y and forms the preterit as a regular -OĀ verb, OHOĀ. T also has lost the Y where ŌY(A) is bound with the prefix TLA-, while C gives an applicative form that also loses the Y, ŌILIĀ. ŌYALŌ nonact. ŌY(A).
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 180–181.

ōya = to shell
Horacio Carochi, S.J., Grammar of the Mexican language with an explanation of its adverbs (1645), translated and edited with commentary by James Lockhart, UCLA Latin American Studies Volume 89 (Stanford: Stanford University Press, UCLA Latin American Center Publications, 2001), 508.