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lynchpin

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lynchpin in WordNet English dictionary

noun
  1. a central cohesive source of support and stability
    "faith is his anchor"; "the keystone of campaign reform was the ban on soft money"; "he is the linchpin of this firm"
    anchor  mainstay  keystone  backbone  linchpin  lynchpin 
  2. pin inserted through an axletree to hold a wheel on
    linchpin  lynchpin 
WordNet Lexical Database v3.0, © 2006 Princeton University


lynchpin in English Wiktionary

 
  1. (noun) a pin inserted through holes at the end of an axle, so as to secure a wheel
  2. (noun) (figurative) a central cohesive source of stability and security; a person or thing that is critical to a system or organisation.
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