sleeper nest

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Noun

sleeper nest - a nest of sleepers awaiting a prearranged signal; "sleeper nests of Islamic terrorists were capable of launching major attacks in Europe"

nest - a gang of people (criminals or spies or terrorists) assembled in one locality; "a nest of thieves"

sleeper - a spy or saboteur or terrorist planted in an enemy country who lives there as a law-abiding citizen until activated by a prearranged signal