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English definition of “run riot”

run riot

C2 If people run riot, they behave in a way that is not controlled, running in all directions or being noisy or violent: I dread them coming round because they let their kids run riot. If your imagination runs riot, you have a lot of strange, exciting, or surprising thoughts: My imagination was running riot, thinking of all the ways that I could spend the money.
(Definition of run riot from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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