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Jyutping si1 zi2 hoi1 daai6 hau2
Pinyin shī zǐ kāi dà kǒu

Definitions (粵典–words.hk)
  1. 語句
    開交換​條件​開得​過度​貪心
    to request benefits for exchange too greedily
Definitions (Kaifangcidian)
  1. 漫天要價 – 漫天要价
  2. 瞞天要價 – 瞒天要价

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Jyutping si1 zi2 hoi1 daai6 hau2
Pinyin shī zi kāi dà kǒu

Definitions (CC-CANTO)
  1. requesting too much exceeding its value (idiom)