Real Dictionary

stampede
If a lot of people all do the same thing at the same time, you can describe it as a stampede.
If there is a stampede, a group of people or animals run in a wild, uncontrolled way.
verb: If a group of animals or people stampede or if something or someone stampedes them, they run in a wild, uncontrolled way.

stampede in American English
a sudden, headlong running away of a group of frightened animals, esp. horses or cattle
intransitive verb: to scatter or flee in a stampede
noun: a sudden, frenzied rush or headlong flight of a herd of frightened animals, esp. cattle or horses
transitive verb: to cause to stampede

stampede in British English
noun: an impulsive headlong rush of startled cattle or horses
verb: to run away or cause to run away in a stampede