undercover

3 definitions • 5 examples

working secretly using a false appearance in order to get information for the police or government:

an undercover police operation

an undercover detective

secretly and using a false appearance in order to get information for the police or government:

He was working undercover at the time, probably for the CIA.

He is ordered to go undercover to infiltrate the criminal underworld.

working secretly to obtain information, esp. for the police:

an undercover cop