Machines or tools that crush things, or people who crush; plural of crusher.
From crush (Old French croissir) plus -er (one who does something) plus -s for plural. Crusher has meant both a device and a person for centuries.
Jaw crushers in mining operations can pulverize boulders the size of cars into gravel—watching one work is watching raw power, and the same basic design has been used for over a century.
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