linchpin - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online (US)

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English definition of “linchpin”

linchpin

noun (also lynchpin) uk   us   /ˈlɪntʃ.pɪn/
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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