打爛砂盆問到篤 [－烂－－问－笃]

Jyutping daa2 laan6 saa1 pun4 man6 dou3 duk1
Pinyin dǎ làn shā pén wèn dào dǔ

Definitions (CC-CANTO)
  1. to find things out in a thorough way by asking every detail
Definitions (Wiktionary)
  1. phrase, Cantonese, idiomatic
    to keep asking questions to get to the bottom of something
    (syn.) 打破砂锅问到底, 打破砂鍋問到底
Definitions (Kaifangcidian)
  1. 打破沙鍋問到底 – 打破沙锅问到底