Correct

翕动

/ xīdòng /
Strokes

Definition

to open and close (the mouth etc)

Example

As a Verb

(of lips, nostrils, etc) open and close

1
zuǐchún
嘴唇
dòng
翕动
le
xià
  
,
què
méiyǒu
没有
shuō
shénme
什么
  

She moved her lips but did not say anything.

2
dòng
翕动
chìbǎng
翅膀

flap the wings