Nibble \Nib"ble\, 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.

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

Source: Webster's Revised Unabridged Dictionary (1913)
 

Nibble \Nib"ble\, n. A small or cautious bite.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Nibble \Nib"ble\, v. t. [imp. & p. p. Nibbled; p. pr. & vb. n. Nibbling.]

[Cf. Nip.]

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.

Source: Webster's Revised Unabridged Dictionary (1913)