riot [ˈraɪət]

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n.暴（骚）乱，（色彩等）极度丰富；vi.聚众闹事

a noisy , violent , and uncontrolled public meeting

They had to call the police in order to put down the riot. 他们只得叫来警察以平定骚乱。
Flowers of all sorts are blooming in a riot of colour. 百花盛开，万紫千红。