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English definition of “linchpin”

linchpin

noun [C] (also lynchpin)     /ˈlɪntʃpɪn/
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: linchpin of sth Consumer spending is the linchpin of the economy.
(Definition of linchpin noun from the Cambridge Business English Dictionary © Cambridge University Press)
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