Chuck \Chuck\, n.
   1. A slight blow or pat under the chin.
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   2. A short throw; a toss.
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   3. (Mach.) A contrivance or machine fixed to the mandrel of a
      lathe, for holding a tool or the material to be operated
      upon.
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   Chuck farthing, a play in which a farthing is pitched into
      a hole; pitch farthing.

   Chuck hole, a deep hole in a wagon rut.

   Elliptic chuck, a chuck having a slider and an eccentric
      circle, which, as the work turns round, give it a sliding
      motion across the center which generates an ellipse.
      --Knight.
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