Definition of bull run:
(n) :
(finance) A contiguous period during which a stock market is a bull market.
(n) :
(bullfighting) An event in which people run with bulls in the streets.
(n) :
Two battles of the American Civil War, occurring in 1861 and 1862 on the Virginia stream near Manassas, also known as the 1st and 2nd Battles of Manassas.
(n) :
A stream in Virginia, United States, a tributary of the Occoquan.
(n) :
A river in Oregon, United States, a tributary of the Sandy.
(n) :
A census-designated place in Prince William County, Virginia, United States.