Definition
An unintentional error in speech, where you say something different from what you meant to.
失误
During the meeting, he accidentally said the competitor's name instead of ours; it was a slip of the tongue.
在会议中，他不小心说出了竞争对手的名字而不是我们的；这是一个口误。
She meant to say she loved the dress, but it came out as she hated it due to a slip of the tongue, which was quite embarrassing.
她本意是说她喜欢这件衣服，但由于口误，她说成了讨厌它，这让她很尴尬。
I intended to praise his performance, but due to a slip of the tongue, I said he performed poorly; it was a real blunder.
我本想赞美他的表演，但由于口误，我说他表现得很差；这真是个大失误。