GET / TURN NASTY


Meaning of GET / TURN NASTY in English

1.

to become threatening and violent :

You'd better do what he says or he'll turn nasty.

2.

to become bad or unpleasant :

It looks as though the weather is going to turn nasty again.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.