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Teeter-totter
[NOUN]1
a plaything consisting of a board balanced on a fulcrum; the board is ridden up and down by children at either end
Examples
1. So a first class lever is like a teeter-totter.
2. The keyboard action is very simple, just a teeter-totter motion.
3. That is like a teeter-totter.
4. It's like a teeter-totter!
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