linchpin
[ linch-pin ]
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Part of Speech noun
Origin + Etymology
Late middle English from Old English lynis (in the sense ‘linchpin’) + pin
Synonyms
  • center
  • core
  • cornerstone
Antonyms
  • unavailable
Definition
a person or thing vital to an enterprise or organization
Example
Rachel is the linchpin of the operation and the business could not go on without her.
Usage Over Time

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