A question about the phrase 打破沙锅问到底
I would like to know more about the phrase 打破沙锅问到底. I know the meaning of it, but I am curious to know the thinking behind it as it is very strange phrase. Why do you say it like this, and not in a less abstract way?

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Answer

Literally, "Incessant questioning until the pot cracks".  It is just a colorful idiom of exaggeration.  不要让她知道, 否則她会打破沙锅问到底.  It is just like in English using "raining like cats and dogs".

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打破沙锅问到底 the original sentence is 打破砂锅璺到底. "璺" is "纹“ ，means crack. so the sentence means " the casserole brokn , the cracks got to the bottom."
If you want to know why we say it like this . just remmember : China's food culture penetrates into many aspects of Chinese culture..

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It comes from a play on words.

“问” puns “纹”, which is the crack at the bottom of a broken “砂锅”.

A decent broken 砂锅 tends to have “纹/问” all the way to the bottom.

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This information might be a bit long, but i think it's quite helpful for this question.

http://iask.sina.com.cn/b/16950147.html