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Jyutping paak3 sam1 hau2
Pinyin pāi xīn kǒu

Definitions (CC-CANTO)
  1. describes the act of promising to take on something or to help out someone with full confidence
Definitions (粵典–words.hk)
  1. 動詞、俚語
    好​有​信心​咁​作保​證
    to guarantee confidently
    • 佢嗰陣拍晒心口咁話會還錢,而家連影都無隻。
      佢𠮶阵拍晒心口咁话会还钱,而家连影都无只。
      keoi5 go2 zan2 paak3 saai3 sam1 hau2 gam2 waa6 wui5 waan4 cin2, ji4 gaa1 lin4 jing2 dou1 mou5 zek3.
      She promised to pay back but now can't been found anywhere.
Definitions (Kaifangcidian)
  1. 保證 – 保证
  2. 一口承擔 – 一口承担
  3. 作保證 – 作保证
Examples (Tatoeba—Cantonese-English)
  1. Cantonese
    我可以拍心口讲,佢做生意实成世都唔会成功。
    我可以拍心口講,佢做生意實成世都唔會成功。
    ngo5 ho2 ji5 paak3 sam1 hau2 gong2 , keoi5 zou6 saang1 ji3 sat6 sing4 sai3 dou1 m4 wui2 sing4 gung1 。
    • It may safely be said that he will never succeed in business.