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你知我知

between you and me

→ 你
phrase Rare #26,997
between you and me An idiomatic expression meaning that only the speaker and listener know something, often implying that it should remain secret.
CH: 这件事你知我知，别告诉别人。
EN: This is just between you and me—don’t tell anyone else.

天知地知你知我知

Heaven knows, earth knows—you know, and I know.

— 蝴蝶梦 (1940)

你知我知

You know it, and I know it.

— 美国黑帮 (2007)

我要说的只能是你知我知。

What I'm about to say must stay between you and me.

只有你知我知，恰特吉先生不知

It's just between you and me; Mr. Chatterjee doesn't know.

— 巴菲的奇妙命运 (2012)