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Jyutping gaam1 mak6 kyun4
Pinyin jiān mò quán

Definitions (Wiktionary)
  1. noun
    right to silence
    (syn.) 沉默權, 沉默权
Definitions (兩岸三地生活差異詞語彙編—Two Shores Three Places)
  1. 法律與犯罪:臺
    緘默權
  2. 法律與犯罪:陸
    沉默權