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Jyutping soeng1 min6 dou1 gwai2
Pinyin shuāng miàn dāo guǐ

Definitions (Wiktionary)
  1. noun, Hokkien, Quanzhou, Xiamen
    double-dealer; double-crosser
  2. adj, Hokkien, Quanzhou, Xiamen
    double-dealing
    (syn.) 兩面派, 两面派