Definition of linchpin in English:

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linchpin

Pronunciation: /ˈlɪn(t)ʃpɪn/
(also lynchpin)

noun

1A pin passed through the end of an axle to keep a wheel in position.
Example sentences
  • He put the wheel back and secured it with a new linchpin, which he carved from a piece of wood.
2A person or thing vital to an enterprise or organization: nurses are the linchpin of the National Health Service
More example sentences
  • Nurses will be the linchpin to the Government's grandiose plans to modernise and improve the National Health Service, one of their leaders says.
  • But at the same time, she said that these memos, which after all was the lynchpin, the core of your broadcast, were not real.
  • The diversity and broad appeal that had been the linchpin of its success now drained away like vital oil.

Origin

Late Middle English: from Old English lynis (in the sense 'linchpin') + pin.

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