A mechanical cutting apparatus with a heavy movable blade, worked by a lever or foot pedal. A guillotine is a tool designed to produce quick, easy, and straight cuts through paper, sheet metal, and some other materials.TAKE NOTE! Be careful! If this device reminds you of the French Revolution, there's good reason: People have lost body parts from the use of guillotines!(pr. GEE-əh-TEEN) Also see scissors and technology.