run riot
run riot {v. phr.}
1. To act freely or wildly; not control yourself.
The monkey got out of his cage and ran riot in the pet shop.
John let his imagination run riot, thinking he was hunting lions in Africa.
2. To be or grow in great numbers or large amounts.
Daisies ran riot in the meadow.
Compare: RUN WILD.
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Source: A Dictionary of American Idioms