Undercover

usgb/ˌʌndərˈkʌvər/Volume
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Secret MissionsPlay
Used to describe activities that require complete secrecy, often for security or legal reasons. SlideShe was on an undercover mission to gather intelligence.
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Crime InvestigationPlay
Commonly used in the context of police or detectives secretly gathering evidence. SlideThe officer went undercover to catch the thief.
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Hidden IdentityPlay
Implies someone is hiding their true identity to avoid detection, usually by blending in. SlideHe wore a disguise to stay undercover at the party.