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idler  n 
1 a person who idles 
2 another name for   idle pulley   idle wheel 
3  (Nautical) a ship's crew member, such as a carpenter, sailmaker, etc., whose duties do not include standing regular watches 
idler shaft    n 
a shaft carrying one or more gearwheels that idles between a driver shaft and a driven shaft, usually to reverse the direction of rotation or provide different spacing of gearwheels, esp. in a gearbox