The crossword solution for the term 'Nibble Away (On)' is 'GNAW, ' which is a four-letter word. Gnawing is an action that involves biting and chewing something with the teeth, usually to break it down into smaller pieces. It is commonly associated with animals, such as rodents, but can also be done by humans. In this context, 'Nibble Away (On)' could mean to slowly eat away at something, such as a snack or a piece of food.