"gnaw" | Definition and Related Words

Verb

Bite or chew on with the teeth (synset 201448216)
"gnaw an old cracker"
is a type of:
- chew, jaw, manducate, masticate - chew (food); to bite and grind with the teeth
- bite, seize with teeth - to grip, cut off, or tear with or as if with the teeth or jaws
Become ground down or deteriorate (synset 200276052)
"Her confidence eroded"

is a type of: crumble, decay, dilapidate - fall into decay or ruin

same as: eat at, erode, gnaw at, wear away