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Jyutping bei3 ji4 bat1 syun1
Pinyin mì ér bù xuān

Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. phrase, idiomatic
    to conceal a secret and not disclose it
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (None)
  1. Cantonese
    秘而不宣
    秘而不宣