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vi>
1.b> (.i> at) (), ; to gnaw (at) a bone ; to gnaw the bit ( i>); to gnaw one's lips in rage ; a mouse was gnawing at crust of bread ;
2.b> () , i>; rust gnaws away iron ;
3.b> (.i> at) (), , ; to be constantly gnawed by fear ; pain gnawed (at) his heart .