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Jyutping daam1 si2 m4 tau1 sik6
Pinyin dān shǐ wú tōu shí

Definitions (粵典–words.hk)
  1. 語句
    形容​一個​人​非常​老實​可靠
    to be completely honest, would not even think of doing anything dishonest; literally: to carry faeces and not steal anything to eat
    • 佢平時擔屎都唔偷食,一定唔會係佢偷咗你啲嘢。
      佢平时担屎都唔偷食,一定唔会系佢偷咗你啲嘢。
      keoi5 ping4 si4 daam1 si2 dou1 m4 tau1 sik6, jat1 ding6 m4 wui5 hai6 keoi5 tau1 zo2 nei5 di1 je5.
      He is completely trustworthy, he must not be the one who stole your things.

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Jyutping daam1 si2 m4 tau1 sik6
Pinyin dān shǐ m2 tōu shí

Definitions (CC-CANTO)
  1. literally: not take the shit; In fact, to describe this man as a very honest person, rigid, not flexible, not to be taken advantage of
Examples (粵典–words.hk)
  1. Cantonese
    讲句公道说话,佢份人担屎唔偷食。
    講句公道説話,佢份人擔屎唔偷食。
    gong2 geoi3 gung1 dou6 syut3 waa6, keoi5 fan6 jan4 daam1 si2 m4 tau1 sik6.
    • To be fair , we must say that he is honest to a fault.
  2. Cantonese
    佢好仔嚟㗎,担屎唔偷食。
    佢好仔嚟㗎,擔屎唔偷食。
    • He is a generous man - and absolutely honest.
  3. Cantonese
    我做看更一向担屎唔偷食,个个街坊都知,你想借失窃呢单嘢拆我招牌?无咁易。
    我做看更一向擔屎唔偷食,個個街坊都知,你想借失竊呢單嘢拆我招牌?無咁易。
    • I'm honest and clean in my post as a security, and all the neighborhood know that well, you want to humiliate me by the case of theft ? Not that easy.