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一、详细释义：
n.
长沙发椅，睡椅 [C]
例句：
I lay fast asleep on the couch, which was as soft as down, and did not wake until late in the morning.
我在软如绒毛般的长沙发椅上睡着了，一直睡到早晨很晚才醒来。
诊察台，长榻 [C]
例句：
Lie down on the couch there. Let me examine your belly.
在那床上躺下。让我检查一下你的腹部。
例句：
On the couch lay a pregnant woman.
诊察台上躺着一个孕妇。
涂底，涂层
弯下 [T]
例句：
The fox couched itself ready to spring.
狐狸伏下身准备跃起。
放平 [T]
例句：
The soldiers couched their rifles and prepared to charge.
士兵们将步枪放平准备冲锋。
（使）躺卧 [I,T]
例句：
He saw a tiger couching itself by the tree.
他看见一只老虎躺在树旁。
例句：
She couched on a sofa.
她斜倚在沙发上。
隐蔽，蹲伏，埋伏 [I]
例句：
They couched in the wood to rob the travelers.
他们埋伏在树林里以抢劫旅客。
v.
表达，措词 [T]
例句：
The refusal was couched in friendly language.
他用友善的语言表达了拒绝之意。
例句：
He couched his request in very polite terms.
他以非常礼貌的言词表达了自己的要求。
二、词义辨析：
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。
三、相关短语：
couch grass
n.茅草
studio couch
n.可以当床用的长沙发
couch potato
n.终日懒散在家的人n. 电视迷
四、参考例句：
He is a couch potato.
他是个老泡在电视机前的人。
On the couch lay a pregnant woman
诊察台上躺着一个孕妇。
His black leather couch looks expensive.
他的黑色皮长沙发看上去很昂贵。
Lie down the diagnostic couch over there.
躺到那诊断床上去。
A couch performs a double service.
躺椅可以（坐卧）两用。
Peter is a couch potato. He is always sitting in the couch and watching television.
Peter是个电视迷。他总是坐在沙发上看着电视。
The dust under the couch was a centimeter thick!
沙发底下的灰尘有一厘米那么厚！
Lie down on the couch if you're feeling ill.
如果你感觉不舒服就躺到沙发上去。
Couch surfing is a new way of traveling.
沙发客是一种新型的旅游形式。
Get up off the couch and get some exercise instead.
离开沙发，做点运动吧。
游客
