Correct

来势

/ láishì / 
Strokes

Definition

momentum of sth approaching

Example

As a Noun

gathering momentum; oncoming force

1
Zhè
这
cháng
场
yùndòng
运动
láishì
来势
hěn
很
měng
猛
  
。

The campaign came with a great momentum/power/drive.

2
Bàofēngyǔ
暴风雨
láishì
来势
hěn
很
měng
猛
  
。

The onslaught of the storm is fierce.

3
Láishìxiōngxiōng
来势汹汹

bear down menacingly