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Jyutping sang1 gei6
Pinyin shēng jì

Definitions (Wiktionary)
  1. noun
    birthday of a deceased person
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)

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Jyutping saang1 gei6
Pinyin shēng jì

Definitions (粵典–words.hk)
  1. 名詞
    死​人​嘅​生日
    birthday of a dead person
  2. 近義詞
    冥壽