Related Clues:

• Chew on persistently
• Nibble to no end
• What beavers do
• Use incisors
• Chew (on), beaver-style
• Teeth-related verb
• Bite at, nibble
• Irk, with 'at'
• Trouble, with 'at'
• Bite at persistently
• Chew on wood, say
• Nibble cheek once taken aback
• Chew like a porcupine
• Chew like a gopher
• Use one’s incisors