mess up解释如下：

1. 搞脏；弄乱：
例句:

They told us not to mess up the room.
他们告诉我们不要把房间弄脏。

I'm all messed up after working on the car.
我摆弄了车子以后全身都弄脏了。 　　

This wind will mess my hair up.
这风要吹乱我的头发。


2. [口语常用]犯错；破坏；弄糟；搞砸：
例句:

I really messed up my chemistry exam. 化学考试我考砸了。

Our travel arrangements have been messed up by the ticket office.
我们的旅行安排被售票处搞乱了。


3. 陷入困境：
例句:

He is messing up.
他陷入困境。

mess up解释如下：

1. 搞脏；弄乱：
例句:

They told us not to mess up the room.
他们告诉我们不要把房间弄脏。

I'm all messed up after working on the car.
我摆弄了车子以后全身都弄脏了。 　　

This wind will mess my hair up.
这风要吹乱我的头发。


2. [口语常用]犯错；破坏；弄糟；搞砸：
例句:

I really messed up my chemistry exam. 化学考试我考砸了。

Our travel arrangements have been messed up by the ticket office.
我们的旅行安排被售票处搞乱了。


3. 陷入困境：
例句:

He is messing up.
他陷入困境。