get nasty

Từ điển Oxford Advanced Learner 8th

get/turn ˈnasty idiom
1. to become threatening and violent
•You'd better do what he says or he'll turn nasty.
•After the game, things turned nasty and there were fights in the streets.
2. to become bad or unpleasant
•It looks as though the weather is going to turn nasty again.
Main entry: ↑nasty_idiom