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.
To bite in agony or rage.
To corrode; to fret away; to waste.
To use the teeth in biting; to bite with repeated effort, as in eating or removing with the teethsomething hard, unwiedly, or unmanageable.
Do what you love. Know your own bone; gnaw at it, bury it, unearth it, and gnaw it still. Henry David Thoreau
Cash - in savings accounts, short-term CDs or money market deposits - is great for an emergency fund. But to fulfill a long-term investment goal like funding your retirement, consider buying stocks. The more distant your financial target, the longer inflation will gnaw at the purchasing power of your money. Suze Orman
I keep going over a sentence. I nag it, gnaw it, pat and flatter it. Janet Flanner
My understanding is, the fans are so ravenous in Canada, they gnaw on the stars. William Shatner
It's really hard when people write nasty things about you all the time. As much as good things are said about you, it's always those one or two bad comments that really stay with you and gnaw at you. I try not to read that stuff if I can. Jordin Sparks