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Jyutping bat1 ho2 gou3 jan4
Pinyin bù kě gào rén

Definitions (CC-CEDICT)
  1. hidden
  2. kept secret
  3. not to be divulged
Definitions (粵典–words.hk)
  1. 形容詞
    秘密​,​唔​可以​俾人知
    secret; confidential; cannot let anyone know
    • 不可告人嘅秘密
      不可告人嘅秘密
      bat1 ho2 gou3 jan4 ge3 bei3 mat6
      a secret which must not be revealed to other people
Definitions (Wiktionary)
  1. phrase, idiomatic, of something negative
    hidden; not to be divulged
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    不可告人嘅秘密
    不可告人嘅秘密
    bat1 ho2 gou3 jan4 ge3 bei3 mat6
    • a secret which must not be revealed to other people