root out

US /ruːt aʊt/
UK /ruːt aʊt/
"root out" picture
1.

根除, 查明

find and get rid of a person or thing that is unwanted

:
The police are trying to root out corruption in the department.
警方正试图根除部门内的腐败。
We need to root out the cause of the problem.
我们需要查明问题的根源。