undercover

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Adjective[change]

Positive
undercover

Comparative
more undercover

Superlative
most undercover

  1. An action or person is undercover if it is hidden or secret,
    We're planning an undercover operation to try to catch those people.
  2. Something is undercover if it involves spying.
    We sent three undercover agents to that country to try to find out what their government plans to do.