A bull run is a term that refers to a sustained period of rising prices or optimism in the financial markets. It is often associated with the stock market, but it can also be used to refer to other marketplaces such as currency or real estate. There are several synonyms that can be used to describe a bull run, including a rally, a surge, an upswing, an escalation, and a boom. These terms are often used interchangeably to describe the same phenomenon, which is a period of market activity in which asset prices and investor confidence are high. A bull run can last for weeks, months, or even years, depending on a variety of factors such as economic conditions and investor sentiment.