Can I tell a secret? Don't tell anyone. OK. What?

我告诉你个秘密，别告诉任何人。好的，什么事？

youdao

Don't tell a secret to anybody, unless you want the whole world to know it.

不要将你的秘密告诉任何人，除非你想全世界的人都知道你的秘密。

youdao

"Let the cat out of the bag" is an idiom meaning to tell a secret by mistake.

“让猫从袋子里跑出来”是惯用语，意思是无意中泄露秘密。

youdao

I might even open up my heart to you and tell a secret.

VOA: special.2010.07.11

And then he says to Franny: "I'll tell you a terrible secret. Are you listening to me?

然后他对弗兰尼说：,我告诉你一个很可怕的秘密，你在听吗？

耶鲁公开课 - 1945年后的美国小说课程节选

If you tell about something that was supposed to be a secret, we say you let the cat out of the bag.

VOA: special.2009.09.27

Headless and armless, the figure tilted slightly on its stand, as if leaning over to tell a secret.

NEWYORKER: The Visitor

You know, suddenly, let me tell you a secret.

NPR: The Lasting Appeal of Orff's 'Carmina Burana'

Congress is incensed that the CIA did not tell it of a secret programme (which may have had to do with the assassination of terrorists), apparently under orders from Mr Cheney, bringing the former vice-president a step closer to formal investigation.

ECONOMIST: Spies, torture and terrorism