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Jyutping saai1 seng1 waai2 hei3
Pinyin sāi shēng huài qì

Definitions (Kaifangcidian)
  1. 白費脣舌 – 白费唇舌

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Jyutping saai1 sing1 waai6 hei3
Pinyin sāi shēng huài qì

Definitions (CC-CANTO)
  1. efforts wasted