"a slip of the tongue" in Chinese (Simplified)
口误
Definition
说话时无意中的错误，比如说错词或发音错误。
Usage Notes (Chinese (Simplified))
属于口语表达，常用于说错话后道歉或澄清。仅指口头错误，不指书写错误。经常作为解释或宽容使用。
Examples
It was a slip of the tongue; I meant to say April, not August.
那只是**口误**，我本来想说四月，不是八月。
Sorry, that was a slip of the tongue.
对不起，那是**口误**。
He called me by the wrong name—it was just a slip of the tongue.
他叫错了我的名字——只是**口误**。
Wow, that was an embarrassing slip of the tongue during my speech!
哇，我演讲时那真是个尴尬的**口误**！
Don't worry, everyone makes a slip of the tongue now and then.
别担心，每个人都会时不时地发生**口误**。
She meant to say 'seat,' but had a slip of the tongue and said 'sheet' instead.
她本来想说“座位”，结果**口误**说成了“床单”。