Correct

不动声色

/ bù dòng shēng sè / 
Strokes

Definition

not a word or movement (idiom); remaining calm and collected/not batting an eyelid

Example

Definition

keep one's countenance; betray no emotion; maintain one's composure; remain calm and collected

1
Biéren
别人
dōu
都
huāng
慌
le
了
shén
神
  
,
tā
他
què
却
bùdòngshēngsè
不动声色
  
,
méishìr  
没事儿
shìde
似的
  
。

While all the others were thrown into a panic, he remained calm as if nothing had happened.

2
Jǐngchá
警察
xiǎng
想
bùdòngshēngsè
不动声色
dì
地
jìnxíng
进行
zhècì
这次
xíngdòng
行动
  
。

The police wanted to keep the operation as low-key as possible.

3
Bùdòngshēngsè
不动声色
de
的
wánxiào
玩笑

dry jest