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Jyutping zan1 do2
Pinyin zhēn duǒ

Definitions (CC-CANTO)
  1. a powerful person or gang who has been successfully invoked by someone for protection [colloquial]
Definitions (粵典–words.hk)
  1. 名詞
    身份​證​上面​嘅​名​,​真名​。
    the name of a triad protector or triad society successfully invoked for protection