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English definition of “pulley”

pulley

noun [C] uk   /ˈpʊl.i/ us  
a piece of equipment for moving heavy objects up or down, consisting of a small wheel over which a rope or chain attached to the object can be easily pulled or released slowly: The blocks of stone had to be lifted into position with a system of pulleys.
(Definition of pulley from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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