- get to the bottom of sth
- 查根问底: investigate thoroughly
- 盘根问底: cross-examine details
- 追根问底: raise one question after another
- 背刨, 刨根: back gouging
- 刨根儿: get to the root [bottom] of the matter 她总爱刨根儿。 she's never satisfied until she gets to the bottom of things
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