切断

1. Origins, structure, and basic meaning

• Structure: 切断 is read as せつだん and is a noun and する verb for cutting through an object or completely severing a connected line.
• Basic usage: Cutting a pipe with a machine appears in 金属管を切断する, while a line severed by wind appears in 通信線が切断される.

2. Common pitfalls and similar expressions

• Active work and passive damage
  • Active and passive forms can distinguish a planned cutting operation from the result of an accident severing a communication line.
• Difference from 切る
  • 切る has a broad range including cutting, slicing, and switching off, while 切断 suits technical contexts of fully severing an object or connection.