грыз
Gnaw — v. 1) грызть, глодать (at/on) The rabbits escaped by ing (away) at the fence until they had made a hole big enough to get through. 2) разъедать (о кислоте) 3) подтачивать, беспокоить, терзать (at/on) Sorrow is ing at my heart.
Англо-русский словарь Мюллера
To Gnaw — (also: to nibble) - грызть
Англо-русский словарь