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English definition of “undercover”

undercover

adjective [before noun] uk   /ˌʌn.dəˈkʌv.ər/ us    /-dɚˈkʌv.ɚ/
working secretly using a false appearance in order to get information for the police or government: an undercover police operation an undercover detective
undercover
adverb uk   us  
He was working undercover at the time, almost certainly for the British Secret Service.
(Definition of undercover from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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