adjective
used to describe someone or something that is working or operating secretly or undercover
adverb
used to describe an action that is done secretly or in a hidden manner
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The detective went undercover to gather information on the criminal organization.
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I heard that Sarah is going undercover for her latest assignment.
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The cops are sending someone undercover to bust the drug ring.
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She felt like she was living undercover, hiding her true self from the world.