“理解错了”用英语表达可以是 get the wrong end of the stick，寓意：

1、to understand something in the wrong way
以错误的方式理解某事

2、false interpretation
错误的解释

3、to not understand the situation in the right manner
不能正确地理解形势

4、getting the incorrect part 获取不正确的部件

5、misconstrue 误解

6、misinterpret 曲解

7、make a mistake 犯错误

8、misunderstand or misread 误解或误读

9、get it wrong 搞错了

10、err 错误

11、take something amiss 做错了什么

它还有一种表达方式 get hold of the wrong end of the stick.

例如：

1、When Jack and Taylor arrived at the award function together, everyone got the wrong end of the stick.
当杰克和泰勒一起到达颁奖典礼的时候，每个人都理解错了。

2、You got the wrong end of the stick - I never meant that.
你理解错了-我不是那个意思。

3、I think I get hold of the wrong end of the stick, maybe she was pointing out someone else, not me.
我想我理解错了，也许她指的是别人，不是我。