- 刨根问底 páogēnwèndǐ to get to the bottom of somethingto dig up roots and inquire at the base; to investigate a matter thoroughly or inquire into the details of something
- 刨根儿 páogēnr to get to the bottom ofto dig into the roots of something; to get to the heart of a matter or find out the background details
- 刨根究底 páogēnjiūdǐ to get to the bottom of thingsTo investigate a matter thoroughly; to get to the root of a problem or situation.