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English definition of “linchpin”

linchpin

noun uk (also lynchpin)   /ˈlɪntʃ.pɪn/ us  
the linchpin of the most important member of a group or part of a system, that holds together the other members or parts or makes it possible for them to operate as intended: Woodford is the linchpin of the British athletics team.
(Definition of linchpin from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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