piston

noun [C]

/ˈpɪs.tən/

Definition

› a short, solid piece of metal that moves up and down inside a cylinder in an engine to press the fuel into a small space and to send the power produced by it to the wheelsThe engine and engine partsEngines and motors

(Definition of piston noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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Synonyms and related words:

to get rid of something or someone that is not wanted or needed

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