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Jyutping sai3 deng6
Pinyin xì dìng

Definitions (粵典–words.hk)
  1. 名詞、香港
    買賣​樓合​約​嘅​初步​訂金​,​多數​係​樓​價​嘅​3​-​5%​;​見大訂
    initial deposit (of a flat transaction)