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undercover

adjective [before noun]
 
 
/ˌʌn.dəˈkʌv.ər/ US  /-dɚˈkʌv.ɚ/

Definition

working secretly using a false appearance in order to get information for the police or government: an undercover police operation an undercover detectiveHiding and disguisingThe police generally undercover
 
 
adverb
He was working undercover at the time, almost certainly for the British Secret Service.Hiding and disguisingThe police generally
(Definition of undercover adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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