Meaning

noun an upholstered seat for more than one person

noun a flat coat of paint or varnish used by artists as a primer

noun a narrow bed on which a patient lies during psychiatric or psychoanalytic treatment

originFrom Middle English couchen, from Old French (se) couchier, (se) colchier (“go to bed, lay down”), from Latin collocāre (“set in place”), from com- (“together, with”) + locāre. Doublet of collocate.

Etymology from Wiktionary, CC BY-SA 3.0