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Jyutping saai1 hau2 seoi2
Pinyin sāi kǒu shuǐ

Definitions (CC-CANTO)
  1. wasting one's effort or words (spoken)
Definitions (粵典–words.hk)
  1. 動詞
    浪費​時間​同​精神​去​説​服​一​個​人​或者​解釋​一件​事
    to waste one's words; literally: to waste saliva
    • 你咪嘥口水啦,佢咁硬頸點會聽你講吖?
      你咪嘥口水啦,佢咁硬颈点会听你讲吖?
      nei5 mai5 saai1 hau2 seoi2 laa1, keoi5 gam3 ngaang6 geng2 dim2 wui5 teng1 nei5 gong2 aa1?
      Don't waste your words, he is too stubborn to listen to you.
Examples (粵典–words.hk)
  1. Cantonese
    同你讲嘢都嘥口水。
    同你講嘢都嘥口水。
    tung4 nei5 gong2 je5 dou1 saai1 hau2 seoi2.
    • It's a waste of my time to talk to you.
  2. Cantonese
    你咪嘥口水啦,佢咁硬颈点会听你讲吖?
    你咪嘥口水啦,佢咁硬頸點會聽你講吖?
    nei5 mai5 saai1 hau2 seoi2 laa1, keoi5 gam3 ngaang6 geng2 dim2 wui5 teng1 nei5 gong2 aa1?
    • Don't waste your words, he is too stubborn to listen to you.