cog meaning, cog definition | English Cobuild dictionary

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cog

  
  ( cogs    plural  )
1       n-count   A cog is a wheel with square or triangular teeth around the edge, which is used in a machine to turn another wheel or part.  
2    If you describe someone as a cog in a machine or wheel, you mean that they are a small part of a large organization or group.  
cog in the machine/wheel      phrase   v-link PHR  
Mr Lake was an important cog in the Republican campaign machine.     
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