Longman Dictionary of Contemporary English homepage

undercover

 adjective
     
Related topics: Crime and Law
un‧der‧cov‧er [only before noun]
SC undercover work is done secretly by the police in order to catch criminals or find out information:
undercover policeman/cop/agent etc
undercover detectives
—undercover adverb:
a cop who goes undercover to catch drug dealers
He worked undercover in Germany and Northern Ireland.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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