Translation of "gnaw" into Spanish

A cat was tearing at the door, and there was a sound of gnawing rats beneath the hearth-stone.

Un gato estaba arañando la puerta, y había un sonido de ratas royendo debajo de la piedra del hogar.

I see mutant turtles gnawing on festering human flesh.

Yo veo tortugas mutantes mordisqueando carne humana putrefacta.

After a while, that uncertainty begins to gnaw at you.

Luego de un rato, esa incertidumbre te empieza a carcomer.