Chinese Wall
noun Informal.
an insuperable barrier or obstacle, as to understanding.
Origin of Chinese Wall
First recorded in 1905–10
Example sentences from the Web for chinese wall
But the Chinese-wall blockade was tripartite; not confined to closing of the ocean ports.
Four Years in Rebel Capitals |T. C. DeLeon
British Dictionary definitions for chinese wall
Chinese wall
noun
a notional barrier between the parts of a business, esp between the market makers and brokers of a stock-exchange business, across which no information should pass to the detriment of clients
an insurmountable obstacle