Definition of couch:

part of speech: verb

To lie down, as on a bed or place of repose; to lay down in a bed or stratum; to conceal or express in words obscurely; to include or comprise; to recline on the knees, as a beast; to crouch; to fix a spear in the posture for attack; to depress or remove the film that overspreads the pupil of the eye, called a cataract.

part of speech: noun

A place for rest or sleep; a bed; a sofa; in making malt, a layer or stratum of barley spread on the malt- floor.