Part of speech: noun

A tooth projecting from the surface of a wheel.

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Usage examples "cog":

  1. Perhaps I myself might be replaced by a machine- by a few cog- wheels that go round and round! - "Pelle the Conqueror, Vol. 2", Martin Anderson Nexo.
  2. He was a cog in the greatest machine the world has ever seen. - "A Minstrel In France", Harry Lauder.
  3. Back in the East, things have been settled for so long that a man's only a cog in a machine. - "Hidden Gold", Wilder Anthony.