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English definition of “lynchpin”

lynchpin

noun [C]     /ˈlɪntʃ.pɪn/
a linchpinImportant people and describing important peopleFamous peopleWealthy peopleImportant and essential thingsInformation and messages
(Definition of lynchpin noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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