ferret out

US /ˈfɛrɪt aʊt/
UK /ˈfɛrɪt aʊt/
"ferret out" picture
1.

探し出す, 突き止める

to discover or find out something, especially something hidden or difficult to find

:
The detective managed to ferret out the truth after weeks of investigation.
刑事は数週間の捜査の末、真実を突き止めることができた。
It took a lot of effort to ferret out all the necessary information.
必要な情報をすべて探し出すのに多くの労力を要した。