The crossword solution for the term 'neutral or first' is GEAR. GEAR is a mechanical device consisting of a toothed wheel or cogwheel that meshes with another toothed part in order to transmit torque. It is used to change the speed or direction of a machine or to transmit power from one part of a machine to another. Gears are used in many different types of machines, including automobiles, bicycles, and clocks.