A SEESAW is a type of playground equipment consisting of a plank balanced on a fulcrum, allowing people to sit on either end and move up and down. It is also known as a teeter-totter or teeterboard. The term 'SEESAW' is derived from the action of the device, which resembles the motion of a SEESAW. The solution to the crossword for the term SEESAW, E.G. is LEVER, which is a device used to amplify physical force. A LEVER is used in a SEESAW to provide the fulcrum on which the plank is balanced.