qīng​chá

ferret out

清查 qīng​chá
ferret out verb
to investigate thoroughly to identify and remove hidden or undesirable elements or individuals

The police are conducting a city-wide sweep for illegal residents.

inspect verb
to investigate thoroughly, carefully inspect, or verify items such as accounts, inventory, or assets

The finance department is auditing the company's accounts.

Frequency

Movie subtitles
1.70 per million appears in 1% of films
Written text
5.38 per million

Sources

Definitions
CC-CEDICT