Definition
When an event or situation intensifies, it becomes more thrilling and starts to involve more activity.
加劇，白熱化
As the competition reached its final stages, the tension began to hot up.
隨著比賽進入最後階段，緊張氣氛開始升溫。
The plot of the movie started to hot up in the second act, capturing the attention of all the viewers.
電影的劇情在第二幕開始升溫，吸引了所有觀眾的注意力。
As the social movement progressed, the number of participants in the protests began to hot up.
隨著社會運動的進展，抗議活動的參與者開始增加。