sleeper cell
noun
Definitions
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.
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Definitions
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.