The crossword solutions for the term FIRST, SECOND AND REVERSE are GEARS. Gears are mechanical components that are used to transmit motion and torque from one part of a machine to another. They are used in many different types of machines, including cars, bicycles, and other machines. Gears are typically made of metal and have teeth that interlock with each other to create a rotational force. Gears are used to change the speed or direction of a machine, allowing it to move in a specific direction or at a specific speed.