sleeper nest

Noun
  1. A nest of sleepers awaiting a prearranged signal (synset 108261453)
    "sleeper nests of Islamic terrorists were capable of launching major attacks in Europe"
    is a type of: nest - a gang of people (criminals or spies or terrorists) assembled in one locality
    member holonym: 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

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