a slip of tongue 的意思是？

你的唇枪舌剑可以用来痛斥他人，但是有时也会给自己带来麻烦。例如在下面这种情况: a slip of the tongue。 Slip可以解释“溜”或者“失误”，所以a slip of the tongue意思显然是“说溜嘴”或者“失言”。有时候你想说的是一回事，但是嘴上说出来的却是另一回事，在你不经意的情况下错误就溜出口来了。我们来看个例子:

I'm in trouble at home. I called my wife "Susan" last night instead of "Betty." Susan is my old girl friend. Just a slip of the tongue, but Betty is so mad she won't speak to me.

应该是a slip of the tongue

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