A piece of playground equipment that consists of a long, smooth plank set over a rounded crossbar a couple of feet off the ground. A person can sit on each end, and when one goes up, the other goes down. Also called a teeter-totter. The image below shows one that has handles and a pole instead of just a plank of wood, but the basic item is very simple--a straight plank and something rounded for it to rotate over.
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