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Jyutping daai6 gaa1 sam1 ziu3
Pinyin dà gū xīn zhào

Definitions (CC-CANTO)
  1. a secret which everyone knows and no need to talk about out loud/mutual understanding without being spoken
Examples (粵典–words.hk)
  1. Cantonese
    我哋三个由细玩到大,佢嘅为人系点,大家心照啦!
    我哋三個由細玩到大,佢嘅為人係點,大家心照啦!
    ngo5 dei6 saam1 go3 jau4 sai3 waan2 dou3 daai6, keoi5 ge3 wai4 jan4 hai6 dim2, daai6 gaa1 sam1 ziu3 laa1!
    • The three of us have been playing together since we were children right up to adulthood. So how about his personality, well we all know it without saying.