undercover

²undercover

noun

Definition of UNDERCOVER

: a person engaged in undercover activity : spy

Examples of UNDERCOVER

1. <within the city was a well-organized fifth column, and these undercovers would make themselves known as soon as the invading forces breached the city limits>

First Known Use of UNDERCOVER

1962

Related to UNDERCOVER

Synonyms: agent, asset, emissary, intelligencer, mole, operative, spook, spy

Related Words: courier; counterspy, double agent, sleeper; infiltrator, informer, stool pigeon; spymaster, superspy

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