Rocking Sea Saw

An alternating up-and-down or backward-and-forward motion or movement also: a contest or struggle in which now one side now the other has the lead. 2a: a pastime in which two children or groups of children ride on opposite ends of a plank balanced in the middle so that one end goes up as the other goes down.A seesaw (also known as a teeter-totter or teeterboard) is a long, narrow board supported by a single pivot point, most commonly located at the midpoint between both ends; as one end goes up, the other goes down. These are most commonly found at parks and school playgrounds.