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Jyutping tin1 gaau1 haa6
Pinyin tiān jiāo xià

Definitions (Wiktionary)
  1. noun, Min-Nan, figuratively
    the world; everything under the sky; all under heaven
    (syn.) 四海, 区宇, 天下, 四国, 宇內, 薄海, 宇内, 世, 區宇, 四國, 世界, 域中