The Collaborative International Dictionary of English v.0.48:

Coucher \Couch"er\ (kouch"?r), n.
   1. One who couches.
      [1913 Webster]

   2. (Paper Manuf.) One who couches paper.
      [1913 Webster]

   3. [Cf. L. collectarius.] (O. Eng. Law)
      (a) A factor or agent resident in a country for traffic.
          --Blount.
      (b) The book in which a corporation or other body
          registers its particular acts. [Obs.] --Cowell.
          [1913 Webster]