linchpin meaning, linchpin definition | English Cobuild dictionary

Collins

linchpin  

  ( linchpins    plural  ) , lynchpin   If you refer to a person or thing as the linchpin of something, you mean that they are the most important person or thing involved in it.      n-count   with supp, usu N of n  
He's the lynchpin of our team and crucial to my long-term plans.     
English Collins Dictionary - English synonyms & Thesaurus  

Collins
lynchpin      , linchpin         
chief, co-ordinator, cornerstone, director, driving force, principal  

English Collins Dictionary - English synonyms & Thesaurus  

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