The argument became hot.是什么意思？

The argument became hot.

争论变得激烈起来。

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

argument

n. 争论，争吵，论据，[数]幅角，主题，情节；

例句
That argument apart, it is for the Germans themselves to work out how their forces should come together.
撇开那场纷争不谈，德国人自己也应该考虑一下如何将各种力量拧成一股绳。

became

v. 变为，成为（ become的过去式 ）；

例句
It became very clear that the incident was not just an aberration, it was not just a single incident.
事实已经很清楚，这件事不是偶发的，它并不是一起孤立的事件。

hot

adj. 热的，辣的，激动的，热门的；vt. 使兴奋，使激动；adv. 热的，紧迫的；vi. 变热；

例句
...a long, hot and arduous journey...
一段漫长、炎热而又艰苦的旅程