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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