The Collaborative International Dictionary of English v.0.48:

Boot \Boot\, n. [OE. bote, OF. bote, F. botte, LL. botta; of
   uncertain origin.]
   1. A covering for the foot and lower part of the leg,
      ordinarily made of leather.
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   2. An instrument of torture for the leg, formerly used to
      extort confessions, particularly in Scotland.
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            So he was put to the torture, which in Scotland they
            call the boots; for they put a pair of iron boots
            close on the leg, and drive wedges between them and
            the leg.                              --Bp. Burnet.
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   3. A place at the side of a coach, where attendants rode;
      also, a low outside place before and behind the body of
      the coach. [Obs.]
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   4. A place for baggage at either end of an old-fashioned
      stagecoach.
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   5. An apron or cover (of leather or rubber cloth) for the
      driving seat of a vehicle, to protect from rain and mud.
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   6. (Plumbing) The metal casing and flange fitted about a pipe
      where it passes through a roof.
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   Boot catcher, the person at an inn whose business it was to
      pull off boots and clean them. [Obs.] --Swift.

   Boot closer, one who, or that which, sews the uppers of
      boots.

   Boot crimp, a frame or device used by bootmakers for
      drawing and shaping the body of a boot.

   Boot hook, a hook with a handle, used for pulling on boots.


   Boots and saddles (Cavalry Tactics), the trumpet call which
      is the first signal for mounted drill.

   Sly boots. See Slyboots, in the Vocabulary.
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