Nibble

Part of speech: noun (n.)

A small or cautious bite.

Part of speech: verb (v.)

To bite by little at a time; to seize gently with the mouth; to eat slowly or in small bits. Thy turfy mountains, where live nibbling sheep. Shak.

Part of speech: verb (v.)

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. Instead of returning a full answer to my book, he manifestly falls a- nibbling at one single passage. Tillotson.