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Jyutping zi1 cing4 jan4
Pinyin zhī qíng rén

Definitions (CC-CEDICT)
  1. person in the know
  2. insider
  3. informed source
Definitions (Wiktionary)
  1. noun
    person who is in the know (usually about something illegal); insider
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)