Correct

陡变

/ dǒubiàn / 
Strokes

Definition

to change precipitously

Example

As a Verb

change suddenly

1
Xíngshì
形势
dǒu
陡
biàn
变
  
。

The situation changed all of a sudden.

2
Liǎnsè
脸色
dǒu
陡
biàn
变

one's countenance changing abruptly