1. plural of pulley: wheels with grooved rims around which a rope or chain passes, used to lift heavy objects or change the direction of force

Examples

• The construction workers used pulleys to lift the heavy beams.
• The flagpole has pulleys at the top to raise and lower the flag.
• Simple machines like pulleys make work easier by reducing the force needed.
• The theater uses a system of pulleys to move scenery quickly.
• Rock climbers rely on pulleys in their rope and rigging systems.
• The old well had pulleys to help draw water from deep underground.