Roundhouse \Round"house`\, n.
   1. A constable's prison; a lockup, watch-house, or station
      house. [Obs.]
      
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   2. (Naut.)
      (a) A cabin or apartament on the after part of the
          quarter-deck, having the poop for its roof; --
          sometimes called the {coach}.
      (b) A privy near the bow of the vessel.
          
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   3. A house for locomotive engines, built circularly around a
      turntable.
      
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Coach \Coach\ (k[=o]ch; 224), n. [F. coche, fr. It. cocchio,
   dim. of cocca little boat, fr. L. concha mussel, mussel
   shell, Gr. ?, akin to Skr. [,c]ankha. Cf. {Conch},
   {Cockboat}, {Cockle}.]
   1. A large, closed, four-wheeled carriage, having doors in
      the sides, and generally a front and back seat inside,
      each for two persons, and an elevated outside seat in
      front for the driver.
      
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   Note: Coaches have a variety of forms, and differ in respect
         to the number of persons they can carry. Mail coaches
         and tallyho coaches often have three or more seats
         inside, each for two or three persons, and seats
         outside, sometimes for twelve or more.
         
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   2. A special tutor who assists in preparing a student for
      examination. [Colloq.]
      
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            Wareham was studying for India with a Wancester
            coach.                                --G. Eliot.
      
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   3. (Naut.) A cabin on the after part of the quarter-deck,
      usually occupied by the captain. [Written also {couch}.]
      [Obs.]
      
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            The commanders came on board and the council sat in
            the coach.                            --Pepys.
      
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   4. (Railroad) A first-class passenger car, as distinguished
      from a drawing-room car, sleeping car, etc. It is
      sometimes loosely applied to any passenger car.
      
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   5. One who coaches; specif. (sports), a trainer; one who
      assists in training individual athletes or the members of
      a sports team, or who performs other ancillary functions
      in sports; as, a third base coach.
      [+PJC]

Coach \Coach\, v. t. [imp. & p. p. {Coached}; p. pr. & vb. n.
   {Coaching}.]
   1. To convey in a coach. --Pope.
      
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   2. To prepare for public examination by private instruction;
      to train by special instruction. [Colloq.]
      
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            I coached him before he got his scholarship. --G.
                                                  Eliot.
      
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Coach \Coach\, v. i.
   To drive or to ride in a coach; -- sometimes used with it.
   [Colloq.] "Coaching it to all quarters." --E. Waterhouse.
   
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Coacher \Coach"er\, n.
   1. A coachman. [Obs.]
      [Webster 1913 Suppl.]

   2. A coach horse.
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   3. One who coaches; specif. (Baseball), one of the side at
      the bat posted near first or third base to direct a base
      runner; also called a {coach}; as, third base coach.
      [Webster 1913 Suppl. +PJC]