Great Firewall

noun

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

Word History and Origins

Origin of Great Firewall¹

C21: a play on the Great Wall of China

Example Sentences

He was referring to web censorship behind the Great Firewall.

From The Daily Beast

YouTube and Flickr are open to Iranians, while MySpace lies beyond the great firewall.

From The Daily Beast