Correct
掉链子
/ diào liànzi /
Strokes
Definition
one's bicycle chain comes off/(fig.) to let sb down/to drop the ball/to screw up
Example
As a Verb
(of a bicycle chain) come off
1
Wǒ
我
de
的
zìxíngchē
自行车
lǎo
老
diào
掉
liànzi
链子
。
My bike chain keeps coming off while riding.
As a Verb
go wrong (usu at a critical moment); drop the ball
2
Zhè
这
jiàn
件
shì
事
shàng
上
wǒmen
我们
kě
可
bu
不
néng
能
diào
掉
liànzi
链子
。
Let's not drop the ball on this.