- A gear, wheel, or roller interposed between two similar parts to convey motion from one to the other without change in speed or direction of motion.
- See idle pulley.
Variant of idler
- a person who wastes time and does no work; lazy person
- a gear placed between two others to transfer motion from one to the other without changing their direction or speed
- a pulley riding loosely on a shaft, pressing against a belt to guide it or take up the slackalso idler pulley