undercover

/ˌʌndəkˈʌvɐ/

/ˌəndɝˈkəvɝ/

undercover

working or conducted secretly under the supervision of a law enforcement agency to gather information or catch criminals

Examples

1. You can spot undercover cops a mile off.

2. The undercover agent was assigned to watch the criminal organization.

3. The police suspected Mat in a string of burglaries and assigned an undercover officer with a shady past to trail him.

4. And undercover agent gets an exam.