ferret out
US /ˈfɛrɪt aʊt/
UK /ˈfɛrɪt aʊt/

1.
mengesan, mencari
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.
Detektif itu berjaya mengesan kebenaran selepas berminggu-minggu penyiasatan.
•
It took a lot of effort to ferret out all the necessary information.
Ia memerlukan banyak usaha untuk mengesan semua maklumat yang diperlukan.