gnawing
 咬,不斷的苦痛,苛責(a.)咬的,使苦惱的


 Gnaw v. t. [imp. & p. p. Gnawed p. pr. & vb. n. Gnawing.]
 1. To bite, as something hard or tough, which is not readily separated or crushed; to bite off little by little, with effort; to wear or eat away by scraping or continuous biting with the teeth; to nibble at.
    His bones clean picked; his very bones they gnaw.   --Dryden.
 2. To bite in agony or rage.
    They gnawed their tongues for pain.   --Rev. xvi. 10.
 3. To corrode; to fret away; to waste.