American Heritage® Dictionary of the English Language, Fourth Edition
- n. A pulley on a shaft that rests on or presses against a drive belt to guide it or take up slack. Also called idle wheel.
GNU Webster's 1913
- adj. (Mach.) a pulley that rests upon a belt to tighten it; a pulley that only guides a belt and is not used to transmit power.
- n. a pulley on a shaft that presses against a guide belt to guide or tighten it
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