1.
sit, kneel, crouch, etc down
坐下、 跪下、 蹲下
2.
up and down, up and down.
上上下下，上上下下。
3.
A downward movement.
下降，落下向下的运动
4.
downbound commerce (=downbound traffic)
下行(下水, 南下)运量
5.
I'm getting off (ie leaving the train) at the next station.
我下站下（火车）.
6.
Stop, Sam, stop,@ said Mr Winkle trembling violently,
“停下，山姆，停下
7.
I assisted him from the saddle / car.
我扶他下马／下车。
8.
The jaw, especially the lower jaw.
（下）颌颌，尤指下颌
9.
drawdown [groundwater]
水位下降〔地下水〕
10.
Stay, Statan, stay!" roared the preacher again.
“停下，撒旦，停下
11.
"'Under the Gaslight.'
“《煤气灯下》。”
12.
Good afternoon, Harry .
下午好，Harry。
13.
To give birth to(whelps or a whelp).
下（崽），产（仔）
14.
In or to a place beneath; below.
在下面，在底下；向下在或向着地下的地点；在下面
15.
The act or manner of dismounting, especially from a horse.
摔下，下马，下车下来的动作或方式，尤指下马
16.
To become or be capable of becoming removed or detached.
被取（拆）下被取下或拆下或能被取下或拆下
17.
ventral medial hypothalamus
腹中下丘脑 腹中下丘脑
18.
He checked off at 5 p.m.
他下午五点钟下班。