Other army units are completely surrounded and cut-off from communication with their superiors.

其他部队完全被包围，与上级的联系也被切断了。

《柯林斯英汉双解大词典》

When she found out about our relationship, she cut off communication with him.

当她发现他和我恋爱后，她就断绝了和他的联系。

youdao

Based on past experience, it will be several days before the scale of the disaster fully emerges, as communication with the most damaged areas is still cut off.

根据以往的经验，全面了解灾情需几天时间，因为大部分受灾地区通讯依然中断。

youdao

The North says it will stop using maritime shortwave radio frequencies with the South and cut off other means of emergency communication.

VOA: standard.2010.05.27

When lightning struck the box, it blew a fuse, which caused two catastrophic problems: it cut off communication and froze the signal on the color green.

NEWYORKER: Boss Rail

The nonprofit organization reported that the quake cut off phone communication and electricity in parts of Sikkim and West Bengal provinces.

CNN: 18 dead in India, Nepal after magnitude-6.9 quake

The conclave is designed to take outside pressure off cardinals by sequestering them behind a wall of silence where communication with the outside world is essentially cut off, and much of the daily schedule is scripted.

WSJ: Cardinals Gather, Facing Varied Agendas