“Risk Rally”

This is the type of financial jargon that makes us cringe.  “Risk” is supposed to be a stock because, well, to invest in a company’s stock is risky.  “Rally” is when stocks, or other asset prices, rise in value.  So, a “risk rally” is a trading session when most stocks move up in price.  The way to say this is in human English: investors are buying stocks in many sectors, and they are increasing in value as a result.