The Collaborative International Dictionary of English v.0.48:

Dock \Dock\, v. t. [imp. & p. p. Docked; p. pr. & vb. n.
   Docking.] [See Dock a tail. Cf. W. tociaw, and twciaw, to
   dock, clip.]
   1. to cut off, as the end of a thing; to curtail; to cut
      short; to clip; as, to dock the tail of a horse.
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            His top was docked like a priest biforn. -- Chaucer.
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   2. To cut off a part from; to shorten; to deduct from; to
      subject to a deduction; as, to dock one's wages.
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   3. To cut off, bar, or destroy; as, to dock an entail.
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