The Collaborative International Dictionary of English v.0.48:

Couch \Couch\ (kouch), v. t. [imp. & p. p. Couched (koucht);
   p. pr. & vb. n. Couching.] [F. coucher to lay down, lie
   down, OF. colchier, fr. L. collocare to lay, put, place; col-
   + locare to place, fr. locus place. See Locus.]
   [1913 Webster]
   1. To lay upon a bed or other resting place.
      [1913 Webster]

            Where unbruised youth, with unstuffed brain,
            Does couch his limbs, there golden sleep doth reign.
                                                  --Shak.
      [1913 Webster]

   2. To arrange or dispose as in a bed; -- sometimes followed
      by the reflexive pronoun.
      [1913 Webster]

            The waters couch themselves as may be to the center
            of this globe, in a spherical convexity. --T.
                                                  Burnet.
      [1913 Webster]

   3. To lay or deposit in a bed or layer; to bed.
      [1913 Webster]

            It is at this day in use at Gaza, to couch
            potsherds, or vessels of earth, in their walls.
                                                  --Bacon.
      [1913 Webster]

   4. (Paper Making) To transfer (as sheets of partly dried
      pulp) from the wire cloth mold to a felt blanket, for
      further drying.
      [1913 Webster]

   5. To conceal; to include or involve darkly.
      [1913 Webster]

            There is all this, and more, that lies naturally
            couched under this allegory.          --L'Estrange.
      [1913 Webster]

   6. To arrange; to place; to inlay. [Obs.] --Chaucer.
      [1913 Webster]

   7. To put into some form of language; to express; to phrase;
      -- used with in and under.
      [1913 Webster]

            A well-couched invective.             --Milton.
      [1913 Webster]

            I had received a letter from Flora couched in rather
            cool terms.                           --Blackw. Mag.
      [1913 Webster]

   8. (Med.) To treat by pushing down or displacing the opaque
      lens with a needle; as, to couch a cataract.
      [1913 Webster]

   To couch a spear or To couch a lance, to lower to the
      position of attack; to place in rest.
      [1913 Webster]

            He stooped his head, and couched his spear,
            And spurred his steed to full career. --Sir W.
                                                  Scott.
      [1913 Webster]

   To couch malt, to spread malt on a floor. --Mortimer.
      [1913 Webster]