Correct
断线
/ duànxiàn /
Strokes
Definition
(of a guitar, kite etc) to have a string break/(of a tradition etc) to be discontinued/(telephone or Internet connection) disconnected/cut off
Example
As a Verb
disconnect; break off
1
Diànhuà
电话
duànxiàn
断线
le
了
。
The (telephone) line has gone dead. / The line is dead.