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undercover

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clandestinely

مخفیانه

It is used to describe a plainclothes police officer or agent who works secretly to gather information, infiltrate criminal groups, or observe illegal activities without revealing their identity. People typically say an officer is "undercover" when they pose as a civilian, criminal, or other role to blend in. The term originated in early 20th century espionage and police work, becoming standard jargon by the mid 1900s, and has since spread into mainstream vocabulary through crime films, novels, and news reporting.

“undercover”的英语定义和含义

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