How is “get nasty” used?

In 12 Angry Men (1957), one line is: “didn't mean to get nasty.”

Which movie is “get nasty” from?

The clip at the top of this page is from 12 Angry Men (1957).

didn't mean to get nasty.

7 作品で登場 · 1 本目

to become threatening and violent

6 本の映画に登場

1
get / turn nasty
to become threatening and violent
You'd better do what he says or he'll turn nasty.
2
get / turn nasty
to become bad or unpleasant
It looks as though the weather is going to turn nasty again.

定義：Oxford Advanced Learner's Dictionary 第 9 版