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Jyutping lou4 gaam1
Pinyin láo jiān

Definitions (Wiktionary)
  1. noun, Gan, Wu
    prison; jail
    (syn.) 監房, 监狱, 铁屋, 监牢, 清室, 囹圄, 牢, 監獄, 監牢, 牢房, 牢獄, 牢狱, 鐵屋, 大牢, 班房, 监房