Meaning of “undercover” in the English Dictionary

"undercover" in British English

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undercoveradjective [ before noun ]

uk /ˌʌn.dəˈkʌv.ər/ us /ˌʌn.dɚˈkʌv.ɚ/

(Definition of “undercover” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"undercover" in American English

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undercoveradjective [ not gradable ]

us /ˌʌn·dərˈkʌv·ər/

working secretly to obtain information, esp. for the police:

an undercover cop

(Definition of “undercover” from the Cambridge Academic Content Dictionary © Cambridge University Press)