Definition
Used to describe a situation where you are sure you know something and feel very close to remembering it, typically a word or name.
话在嘴边（很快记起来）
I know the actor's name; it's right on the tip of my tongue, but I can't quite recall it at the moment.
我知道那个演员的名字，就在嘴边，但我一时想不起来。
I'm quite sure I've learned this word before; it's on the tip of my tongue.
我很确定我之前学过这个词，就在嘴边。
The advice I wanted to give you is on the tip of my tongue, let me think for a second.
我想给你的建议就在嘴边，让我想一下。