Definition
This idiom suggests that a dishonest individual is best suited to understand and anticipate the actions of another dishonest person.
以贼捕贼
The police believe that to catch that fraud ring, they might need to find someone who used to do similar scams.
警方认为要抓到那个诈骗集团，可能需要找到曾经做过类似诈骗的人。
When the company discovered internal theft, they hired a former hacker to investigate.
当公司发现内部盗窃时，他们聘请了一名前黑客来调查。
To expose this corrupt official, it might take someone else who was once involved in corruption.
要揭发这个贪官，可能需要曾经涉足贪腐的人。