Chinese Wall

noun

Informal.

1. Great Wall of China.

2. an insuperable barrier or obstacle, as to understanding.

Chinese wall

noun

1. 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

2. an insurmountable obstacle

Word History and Origins

Origin of Chinese wall¹

First recorded in 1905–10