A line break or disconnection (e.g., a cut wire or interrupted cable); a break in a circuit causing loss of connection or a failure.
強風で電柱が倒れ、地域の電力が断線した。
Strong winds toppled a utility pole and the area's power lines were severed.
イヤホンの断線で片方から音が聞こえなくなった。
One side stopped producing sound because the earphones' wire was broken.
通信が断線するとデータの転送が中断される。
If the connection is cut, data transfer is interrupted.