Coucher \Couch"er\ (kouch"?r), n. 1. One who couches. 2. (Paper Manuf.) One who couches paper. 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.