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English definition of “ratchet”

ratchet

noun [C] uk   /ˈrætʃ.ɪt/ us  
a part of a machine that allows movement in one direction only. It is usually a wheel with teeth-like parts that either slide over or lock against the free end of a bar.Machine parts
(Definition of ratchet from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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