English

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

 

undercover

 adverb
adverb
BrE BrE//ˌʌndəˈkʌvə(r)//
 
; NAmE NAmE//ˌʌndərˈkʌvər//
 
 
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secretly, in order to find out information for the police, a government, etc. The illegal payments were discovered by a journalist working undercover.

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