1a violent disturbance of the peace by a crowd:riots broke out in the capital [mass noun]:he was convicted on charges of riot and assault [as modifier]:riot police
an uproar:the film’s sex scenes caused a riot in Cannes
an outburst of uncontrolled feelings:a riot of emotions raged through Fabia
[mass noun] archaic uncontrolled revelry; rowdy behaviour:a young lord leaving the city after a night of riot
2 [in singular] an impressively large or varied display of something:the garden was a riot of colour
3 [in singular] informal a highly amusing or entertaining person or thing:everyone thought she was a riot
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Universal
take part in a violent public disturbance:students rioted in Paris (as noun rioting)another night of rioting
behave in an unrestrained way:another set of emotions rioted through him
archaic act in a dissipated way:an unrepentant prodigal son, rioting off to far countries
run riot
behave in a violent and unrestrained way:a country where freelance gunmen run riot, looting and hijacking food
(of a mental faculty or emotion) function or be expressed without restraint:her imagination ran riot
proliferate or spread uncontrollably:traditional prejudices were allowed to run riot