undercover
adjective10 collocationsAvg. frequency: 7.7
A planned secret activity.
A police officer on a secret mission.
A secret agent working in a covert role.
A police detective working in disguise.
A secret assignment or task.
A deceptive operation designed to catch criminals.
A journalist who works in disguise to get a story.
Police forces operating secretly.
Employment or activity done secretly.
A policeman working in a covert role.