A piston is a solid cylinder that moves up and down inside a tube to compress or move gas or liquid, as in a car engine.
From French 'piston', from Italian 'pistone', from 'pistare' meaning 'to pound, crush'. The word describes the pounding motion inside cylinders.
In a car engine, pistons are like metal fists punching up and down dozens of times every second. That frantic motion, controlled by precision, is what quietly pushes your car forward on the road.
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