打破砂鍋問到底 [－－－锅问－－]

Jyutping daa2 po3 saa1 wo1 man6 dou3 dai2
Pinyin dǎ pò shā guō wèn dào dǐ

Definitions (CC-CEDICT)
  1. to go to the bottom of things (idiom)
Definitions (Wiktionary)
  1. phrase, idiomatic
    to keep asking questions to get to the bottom of something
    (syn.) 打烂砂盆问到笃, 打爛砂盆問到篤