Meaning of “run riot” in the English Dictionary

british dictionary

"run riot" in British English

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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 here 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 Learner’s Dictionary & Thesaurus © Cambridge University Press)