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block the case that holds a pulley. [1/9 definitions]
pulley a simple machine that makes lifting something easier. A pulley has a wheel or set of wheels with grooves that a rope or chain can be pulled over.
tackle a rope and pulley used to lift or move a heavy weight. [1/5 definitions]
trolley a pulley wheel held against or traveling on a track or overhead wire. Trolleys conduct electricity from the wire to a vehicle on a track. [1/4 definitions]