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pulley noun [C]. âº a âpiece of âequipment for âmoving âheavy âobjects up or down, consisting of a âsmall âwheel over which a ârope or âchain âattached to the âobject can be âeasily âraised or âlowered: The âblocks of âstone had to be âlifted into âposition with a âsystem of pulleys.
The pulley is usually used in sets of two or more to gain a higher velocity ratio and mechanical advantage. Two sets of pulleys are used, one fixed and one moving. The pulleys are mounted, usually side by side, in a block or frame and the apparatus of pulleys and ropes is generally called the tackle. The whole system or machine is known as a block and tackle.