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British Dictionary definitions for great firewall

Great Firewall

noun
  1. informal a system that prevents access to websites deemed undesirable by the government of the People's Republic of China
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Word Origin

C21: a play on the Great Wall of China
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012