carry coals to newcastle


From The Collaborative International Dictionary of English v.0.48:

Newcastle \New"cast`le\, prop. n.
   A town in England.
   [PJC]

   Carry coals to Newcastle to do something utterly
      superfluous; to do something useless or wasteful; -- from
      the nearness of Newcastle to the coal-mining district.
      [PJC]
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