gnaw at
Verb
Meaning
become ground down or deteriorate
Source: WordNetSynonyms
Antonyms
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Examples
Do what you love. Know your own bone; gnaw at it, bury it, unearth it, and gnaw it still.
Afterwards I learned, that the best way to manage some kinds of painful thoughts, is to dare them to do their worst; to let them lie and gnaw at your heart till they are tired; and you find you still have a residue of life they cannot kill.
I had nixed the idea of having children when I was myself a child, having learned in the 1960s that human overpopulation was literally crowding other species off the planet. Why create another mouth to gnaw at the overburdened earth?
Her confidence eroded