tiān​zhī​dì​zhī​nǐ​zhī​wǒ​zhī

a secret known only to us

天知地知你知我知 tiān​zhī​dì​zhī​nǐ​zhī​wǒ​zhī
a secret known only to us
lit. heaven knows, earth knows, you know and I know; used to describe a secret that is supposedly confidential but is actually known by multiple parties or will inevitably be revealed

Cross-References

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