How do you spell Nibbling

Available Definitions:
1)  v. t. - To bite by little at a time; to seize gently with the mouth; to eat slowly or in small bits.
2)  v. t. - To bite upon something gently or cautiously; to eat a little of a thing, as by taking small bits cautiously; as, fishes nibble at the bait.
3)  n. - A small or cautious bite.