undercover

/ˌən-dər-ˈkə-vər/

adjective

  1. acting or executed in secret; specifically : employed or engaged in spying or secret investigation

noun

  1. a person engaged in undercover activity : spy

noun

  1. something that protects, shelters, or guards: such as

  2. natural shelter for an animal; also : the factors that provide such shelter

  3. a position or situation affording protection from enemy fire