dropour和drop-out一样吗

 不一样！drop out是动词短语。而drop-out是名词或形容词。

drop-out  

n. 逃避现实社会的人；中途退学的人；[计] 漏失

drop out

1.掉下，掉落，掉出，落出：

One of her decayed teeth had dropped out.

她的一颗蛀牙掉了。

As he picked up the purse,the money dropped out.

他捡钱包时，钱掉了出来。

2.放弃；退出，不参与(某种活动)；(中途)退学：

She has dropped out of politics.

她已退出政界。

Teenagers who drop out of high school have trouble finding jobs.

中学辍学的青少年难找工作。

3.(因不满世俗社会的道德标准和准则而)退出世俗(或习俗)社会，逃避现实，隐退：

They are dropping out and trying to find new ways of living.

他们在逃避社会现实并试图找到新的生活方式。

4.(尤指词语等)过时，不再使用：

This word has virtually dropped out of usage today.

这个词实际上现在已不再使用了。

to be dropped out of use after a temporary vogue

时兴一阵之后便废弃不用

5.弃权，放弃(或退出)比赛：

He had injured his leg and had to drop out of the race.

他的腿伤了，不得不退出比赛。

6.[俚语](数学题等)不证自明