ˈīd( ə )lə(r) noun
( -s )
1. : one that idles or is unoccupied : one that spends his time in inaction : a lazy person
2.
a. : idler gear
b. : idler pulley
c. : idler wheel
3. : a member of a ship's crew that has constant day duties and keeps no night watch
4. : an empty railroad car placed between two cars that support a load ; also : an empty flatcar placed at either end of a loaded flatcar to take the overhang but not the weight of a projecting load
5. : a member of a fish-dressing gang who washes gutted fish or a wharf laborer who carries fish and supplies to the cleaners and removes scrap