People were running riot in the streets.人们在街道上闹事。

Crazy thoughts were running riot through my head.我的头脑中不停地冒出许多怪想法。

The weeds have run riot over our poor garden. [=the weeds in our garden have grown quickly and have taken over the garden]我们倒霉的花园里到处都是肆意横生的杂草。