A metal tool with a sharp beveled edge, used to cut and shape stone, wood, or metal. To shape or cut with a chisel. Informal To cheat or swindle. Informal To obtain by deception. To use a chisel. Informal To use unethical methods; cheat: "who's up, who's down and who's chiseling on the side\u201d ( James Reston). Informal To intrude oneself without welcome: always tries to chisel in on our conversations.