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Jyutping kei4 sat6 gwat1 zi2
Pinyin qí shí gǔ zi

Definitions (Wiktionary)
  1. adv, Wu
    actually; as a matter of fact; in fact
    (syn.) 其实, 见真, 實在, 其實骨子裡, 事實上, 实际上, 事实上, 其实骨子里, 实在, 實際上, 其實, 見真