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It's on the tip of my tongue.

从字面上看，“tongue”表示“舌头”，“tip”是“尖、尖端”。有时候，别人问你什么问题，你话到嘴边，可就是说不出来——思维短路了，这时候你就可以说“It's on the tip of my tongue.”

=I’m trying to remember, but I can’t quite remember

我好像记得，但是又说不出来。

John had the answer on the tip of his tongue, but Anne said it first.

约翰虽然有了答案，但话在嘴边就是说不出来，于是安妮先说了出来。

Helen: Who's that?

那是谁?

Rob: Hmm… erm… I can't remember her name… it's on the tip of my tongue.

嗯...呃...我记不清她的名字了，就在嘴边上!