sleeper nest

Definitions of sleeper nest
1

n a nest of sleepers awaiting a prearranged signal

sleeper nests of Islamic terrorists were capable of launching major attacks in Europe”
Type of:
nest
a gang of people (criminals or spies or terrorists) assembled in one locality

Sign up, it's free!

Whether you're a student, an educator, or a lifelong learner, Vocabulary.com can put you on the path to systematic vocabulary improvement.