天知地知你知我知
tiān​zhī​dì​zhī​nǐ​zhī​wǒ​zhī

a secret known only to us

  1. 天 tiān nounproper noun
    God
    God; Heaven; the supreme ruler of the universe in traditional belief
  2. 知 zhī verb
    to know
    to know; to be aware of; to realize or sense
  3. 地 dì noun
    earth
    The earth; the ground; land; soil; fields
  4. 知 zhī verb
    to know
    to know; to be aware of; to realize or sense
  5. 你 nǐ pronoun
    you
    you (singular); used for peers, younger people, or as a general informal term of address (in Taiwan, a female-specific variant form is sometimes used)
  6. 知 zhī verb
    to know
    to know; to be aware of; to realize or sense
  7. 我 wǒ pronoun
    I
    I; me; myself
  8. 知 zhī verb
    to know
    to know; to be aware of; to realize or sense