Definition of undercover adjective from the Oxford Advanced Learner's Dictionary

 

undercover

 adjective
adjective
BrE BrE//ˌʌndəˈkʌvə(r)//
 
; NAmE NAmE//ˌʌndərˈkʌvər//
 
[usually before noun] The police
 
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working or done secretly in order to find out information for the police, a government, etc. an undercover agent an undercover operation/investigation See related entries: The police Wordfinderarrest, charge, cordon, detain, detective, interrogate, plain clothes, police, raid, undercover

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