留置

1. Origins, structure, and basic meaning

• Structure: 留置, read りゅうち, means holding someone or leaving something in a particular place.
• Basic usage: It is used for detention of a person and for leaving an object such as a tube in place.

2. Common pitfalls and similar expressions

• People and objects
  • In the example, 一晩留置された says that a person was detained overnight.
  • 管を体内に留置する means leaving a tube in place inside the body.
• Passive and active
  • 留置された is passive: the subject was made to remain in that place.
  • 留置する is active and expresses the act of holding or leaving something in place.