Definition of sleeper cell in English:

sleeper cell

Syllabification: sleep·er cell

noun

A secretive group of spies or terrorist agents that remain inactive within a target population until ordered to act.
More example sentences
  • Three Saudis and 7 Moroccans were accused of forming a sleeper cell and planning terrorist attacks against ships entering the Straits of Gibraltar.
  • Secretly entering the United States to join a terrorist sleeper cell, he moves in with his childhood friend Sayeed, a physician contentedly living with his family in Jersey City.
  • The plea agreements exposed as a fraud claims made by Attorney General John Ashcroft last October that the arrests in Portland had disrupted a ‘terrorist sleeper cell.’

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Pronunciation: ˈsiːtəʊs
adjective
bearing bristles or setae; bristly