from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A group of people (sleepers) who inconspicuously remain dormant in a community until activated, by a prearranged signal, to perform acts of espionage, sabotage, and/or terrorism.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a cell of sleepers
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