linchpin Meaning in the Cambridge English Dictionary
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Meaning of “linchpin” in the English Dictionary

"linchpin" in British English

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linchpinnoun

(also lynchpin) uk   us   /ˈlɪntʃ.pɪn/
the linchpin of the most ​importantmember 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 ​athleticsteam.
(Definition of linchpin from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"linchpin" in American English

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linchpinnoun [C]

 us   /ˈlɪntʃˌpɪn/
a ​person or thing that is the most ​importantpart of a ​group or system’s ​operation: The city’s River Park is the linchpin of ​itsefforts to ​sell itself as a ​vacationdestination.
(Definition of linchpin from the Cambridge Academic Content Dictionary © Cambridge University Press)

"linchpin" in Business English

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linchpinnoun [C]

(also lynchpin) uk   us   /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 from the Cambridge Business English Dictionary © Cambridge University Press)
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