In financial markets the term kerb is used to describe trading outside official market hours. The expression comes from trading literally...

在金融市场指市场正式营业时间以外的交易。此英文词组源于在证券交易所外的马路边进行交易。

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Some brokers say the stock exchange was overheated because of the effect of the illegal kerb market trading, and blame the government for failing to halt the illegal sharedealing.

ECONOMIST: Emerging stockmarkets