唔死一身潺 [－－－－－]

Jyutping m4 sei2 jat1 san1 saan4
Pinyin wú sǐ yī shēn chán

Definitions (粵典–words.hk)
  1. 語句
    一句​恐嚇​或者​警告​；​其實​係​歇後語​，​上句​係​「​白鱔​上​沙灘​」​或者​「​黃​鱔​上​沙灘​」​，​「​潺​」​係​形容​上​咗​沙灘​分泌​過後滑​潺潺​嘅​皮​膚​，​食埋​「​孱​」​字​，​全句​就​係​一個​人​遇到​好​大​嘅​難​關​，​就算​唔​死​都​會​好​艱難
    a threat or warning that even if the addressee is not going to die, he or she will be go through a lot of pain.

唔死一身潺 [－－－－－]

Jyutping m4 sei2 jat1 san1 saan4
Pinyin wú sǐ yi1shēn chán

Definitions (CC-CANTO)
  1. to going to suffer a lot (often used as a threatening expression) [colloquial]