Undercover
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Secret Missions
Used to describe activities that require complete secrecy, often for security or legal reasons. She was on an undercover mission to gather intelligence.
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Crime Investigation
Commonly used in the context of police or detectives secretly gathering evidence. The officer went undercover to catch the thief.
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Hidden Identity
Implies someone is hiding their true identity to avoid detection, usually by blending in. He wore a disguise to stay undercover at the party.