run riot
if people run riot, they behave in a way that is not controlled, running in all directions or being noisy or violent

[TahlilGaran] Dictionary of Contemporary English ▲

run riot
1.
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.

2.
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.

[TahlilGaran] English Idioms Dictionary ▲

run riot
• run riot/wild
to be or go out of control
The soccer fans ran riot after the game.

The crowd ran wild after the soccer game.

[TahlilGaran] English Idioms Dictionary ▲

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.

[TahlilGaran] English Idioms Dictionary ▲