Synonyms for Eat away:

n.

mutilate, obliterate, vandalize, ravage, shatter, devastate, trash, destroy, ruin. eat away (noun)
erode, fret.

v.

change (verb)
erode, fret.
gnaw (verb)
erode.
undermine (verb)
ruin.

Other synonyms:

mutilate, ravage, vandalize, shatter, destroy, trash, obliterate. devastate. ruin. Other relevant words:
destroy, erode.