godan verb (-su), transitive verb
track down; locate; find out; ferret out
Emphasizes the effort of searching until something is found; often used for people, information, or hard-to-find items. Stronger than 見つける, implying a deliberate search.
警察は容疑者を探し出した。
The police tracked down the suspect.
彼はインターネットで必要な情報を探し出した。
He ferreted out the necessary information on the internet.
図書館でその本を探し出すのに苦労した。
I had trouble locating that book in the library.