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Jyutping zak1 dou6
Pinyin zé dù

Definitions (Wiktionary)
  1. noun, literary
    rule; law; regulation
    (syn.) 纲目, 规定, 守则, 規準, 守則, 繩墨, 條規, 規定, 例, 法度, 规条, 規則, 綱目, 规, 规则, 程度, 規, 規條, 方案, 绳墨, 条例, 纪纲, 紀綱, 規矩, 规矩, 规准, 条规, 條例