thurl /ˈθɝ(ə)l/
  Thurl n.
  1. A hole; an aperture. [Obs.]
  2. Mining (a) A short communication between adits in a mine. (b) A long adit in a coalpit.
  Thurl, v. t.
  1. To cut through; to pierce. [Obs.]
  2. Mining To cut through, as a partition between one working and another.
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