run over
1.在…上驶过；(撞倒后)辗过：
A boy was run over by a truck and got killed immediately.
一个男孩被一辆卡车从身上压过去，当即死亡。
2.溢出：
The water is running over the edge of the bathtub.
水从澡盆的边缘溢出。
3.超过：
We try our best to limit our expenditure to the original sum,but we may run over by a few pounds.
我们尽量把开销限制在原定的数目之内，但可能会超出几镑。
4.(使)在…上掠过；迅速浏览，扫视：
The teacher ran over his notes before the lecture.
教师在讲课前先看一眼讲稿。
5.复习；排练：
She will run over her lines in the evening.
她将在晚上排练一次她的台词。
run down
1.往下跑：
Don't run down the stairs. Just walk down slowly.
下楼梯时别跑，慢慢走下去。
2.往下流：
All rivers run down to the sea.
条条河水向下流入大海。
3.停止运转；停产；耗尽：
The battery in my car ran down this evening.
我的汽车里的蓄电池今天晚上用完了。
My watch has run down.
我的表停了。
4.(健康)衰退；虚弱：
His father is terribly run down and is unfit for work right now.
他的父亲非常虚弱，不适于立刻就上班。