Definition of undercover adjective from the Oxford Advanced American Dictionary

 

undercover

 adjective
adjective
NAmE//ˌʌndərˈkʌvər//
 
[usually before noun]
 
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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
undercoveradverb
 
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The illegal payments were discovered by a journalist working undercover.