From Longman Dictionary of Contemporary EnglishBull RunˈBull ˌRun the place in northeast Virginia in the US where there were two important battles in the american civil war which the Union forces lost to Confederate forces. Many men were killed or hurt in these battles.From Longman Business Dictionarybull runˈbull run [countable]FINANCE a period of time when prices rise on a financial marketThe stock market was on a spectacular bull run in which almost any investment paid off. → run