for the hands, arms to tire, grow stiff (see Karttunen), literally, to become wooden
MĀCUAUHTI for the hands, arms to tire, grow stiff / se cansa las manos (T) [(3)Tp.164]. See MĀ(I)-TL, CUAUHTI.
MĀCUAUHTĪHUA nonact. MĀCUAUHTI. Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 129.