Quiz: Remember the definition of mal de mer?
c.1300, "to overlay with gold, inlay," from Old French couchier "to lay down, place; go to bed, put to bed," from Latin collocare "to lay, place, station, arrange," from com- "together" (see com-) + locare "to place" (see locate). Meaning "to put into words" is from 1520s. Related: Couched; couching. Heraldic couchant ("lying down with the head up") is late 15c., from the French present participle.
mid-14c., from Old French couche (12c.) "a bed, lair," from coucher "to lie down," from Latin collocare (see couch (v.)). Traditionally, a couch has the head end only raised, and only half a back; a sofa has both ends raised and a full back; a settee is like a sofa but may be without arms; an ottoman has neither back nor arms, nor has a divan, the distinctive feature of which is that it goes against a wall. Couch potato first recorded 1979.
(Gen. 49:4; 1 Chr. 5:1; Job 7:13; Ps. 6:6, etc.), a seat for repose or rest. (See BED.)
in modern usage a sofa or settee, but in the 17th and 18th centuries a long, upholstered seat for reclining, one end sloping and high enough to provide a back rest and headrest.