躺下的英文：
couch
lie down
settle oneself
take a load off one's feet

参考例句：

To lie down;recline,as for rest.
躺卧躺下;斜倚，例如休息时

I get into bed at about eleven and go right off to sleep.
我大约在11点上床，躺下就能入睡。

After two glasses of the homemade wine,I had to lie down.It had to lie down.It had knocked me out.
喝了两杯家酿后，我不得不躺下，它使我醉了。

Lie down; lie
横卧;躺下

The children lay down on their stomachs.
孩子们趴着躺下。

She cast herself on(upon)the sofa
她在沙发上躺下。

He had to lie down for a while to rest his legs.
他得躺下一会儿让腿休息一下。

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。

The soldier played dead to escape capture by the enemy.
那个士兵躺下装死，以免被敌人俘虏。

It was about an hour or so after he lay down.
他躺下后大约有一小时左右。

couch是什么意思：
n. 睡椅，长沙发；长榻；诊察台
v. 表达；低下，弯下；蹲着；弯着身子；放平；挺着；躺卧；埋伏，潜伏

She couched on a sofa.
她斜倚在沙发上。

They couched in the wood to rob the travelers.
他们埋伏在树林里以抢劫旅客。

On the couch lay a pregnant woman
诊察台上躺着一个孕妇。

lie是什么意思：
v. 躺，卧；被平放；呈...状态；在于；位于；展现；撒谎；欺骗
n. 谎言

Interest will not lie.
兴趣不会说谎。

an action, appeal that will not lie
不能受理的诉讼、 上诉.

transverse lie presentation
横位产式

down是什么意思：
prep. 在…下，沿着
v. 下降，打倒
n. 潦倒；羽绒；丘陵

Down with hegemonism!
打倒霸权主义！

The sun is down.
太阳下山了。

Close down autos and you close down steel and rubber.
关掉了汽车工业你也就关掉了钢铁工业和橡胶工业。