couch

couch, sofa

这两个名词均可表示“沙发”之意。
couch: 指供昼夜坐卧，似床一样的长沙发或睡椅。
sofa: 指有扶手和靠背，可供多人坐或一个人睡的长沙发，也泛指沙发。

名词 couch:

1. an upholstered seat for more than one person
   同义词：sofa, lounge
2. a flat coat of paint or varnish used by artists as a primer
3. a narrow bed on which a patient lies during psychiatric or psychoanalytic treatment

动词 couch:

1. formulate in a particular style or language
   同义词：frame, redact, cast, put

1. A couch performs a double service.
   躺椅可以(坐卧)两用。
2. An enclosed or curtained couch mounted on shafts and used to carry a single passenger.
   轿架于辕上四周封闭或挂有帘子的睡椅，用于承载单独一个乘客
3. Dad is sleeping on the couch.
   爸爸在长椅上睡觉。
4. His black leather couch looks expensive.
   他的黑色皮沙发看上去很昂贵。

couch

n.（名词）

A sofa.
沙发：沙发
A sofa on which a patient lies while undergoing psychoanalysis or psychiatric treatment.
长榻，躺椅：病人躺在上面进行心理分析或精神病治疗的一种沙发

The frame or floor on which grain, usually barley, is spread in malting.
麦芽床：框架或地板，在上面播撒谷物以使其发芽，通常是大麦
A layer of grain, usually barley, spread to germinate.
一层麦粒：播撒在麦芽床上来使之发芽的一层麦粒，通常是大麦
A priming coat of paint or varnish used in artistic painting.
涂底，涂层：用于艺术绘画中的涂底漆的画布或画板
v.（动词）
couched,couch.ing,couch.es
v.tr.（及物动词）
To word in a certain manner; phrase:
措辞：以某种方式表达；措辞：
例句：
couched their protests in diplomatic language.
以外交辞令来表达他们的抗议

To cause (oneself) to lie down, as for rest.
使躺卧：使（自己）躺下，如为了休息
To embroider by laying thread flat on a surface and fastening it by stitches at regular intervals.
刺绣：在表面上平着缝线并在规律间隔用针角固定来刺绣
To spread (grain) on a couch to germinate, as in malting.
播撒谷物使发芽：在麦芽床上播撒（谷物）以使之发芽，例如酿酒时
To lower (a spear, for example) to horizontal position, as for an attack.
平握：象准备攻击时放低（如矛）到水平位置
v.intr.（不及物动词）
To lie down; recline, as for rest.
躺卧：躺下；斜倚，例如休息时
To lie in ambush or concealment; lurk.
隐蔽，埋伏：潜伏或隐蔽时躺下；埋伏
To be in a heap or pile, as leaves for decomposition or fermentation.
使成堆：成堆或团，例如树叶堆积起来分解或发酵

来源：
Middle English couche
中古英语 couche
from Old French
源自 古法语
from couchier [to lay down, lie down]
源自 couchier [放下，躺下]
from Latin colloc3re * see collocate
源自 拉丁语 colloc3re *参见 collocate

【引伸】
couch.er
n.（名词）