Idle WheelThe middle of three wheels, which simply conveys the motion of one outside wheel to the other outside wheel. Suppose A, B, C to be three wheels, B being the idle or gear wheel. B simply conveys the motion of A to C, or of C to A. Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894 More on Idle Wheel from Infoplease:
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