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The English We Speak from BBC Learning English.
Hello and welcome to the English We Speak.
I'm Helen, and joining me today is Rob.
Hello.
Hey.
Have you heard Neil's good news?
No, what is that?
Well, he ran in the London Marathon and he came first.
That's impossible.
Well, I know it's hard to believe, but he has been training very hard and he's quite a fast runner.
Sorry, Rob, he's lying through his teeth.
He went to the cinema on Sunday.
Oh, did he really?
Well, you've just used a perfect phrase to lie through your teeth.
It means to tell someone something that's completely untrue.
That's why I said it.
So he's giving you false information?
Yes.