n.
1.a public act of violence by an unruly mob
2.a state of disorder involving group violence
3.a joke that seems extremely funny
4.a wild gathering involving excessive drinking and promiscuity riot v.
1.take part in a riot
2.engage in boisterous, drunken merry-making
Idiom of the Day
have a hand in (something)
to be partly responsible for something
I think that the woman had a hand in getting her friend fired from her job.