1. an insect or larva that bores holes in wood, plants, or other materials
2. a tool or machine used for making holes by boring

Examples

• The carpenter ant borer damaged the wooden deck.
• Corn borers can destroy entire crops if left untreated.
• The tree showed signs of bark borer infestation.
• He used a hand borer to make holes for the fence posts.
• The electric borer made quick work of drilling through the concrete.
• Apple tree borers leave telltale sawdust around the trunk.