留置|りゅうちryuuchi[0]heiban (flat)

1. noun, suru verb, transitive verbdetention (usu. during investigation); imprisonment; poundage; custody

• Synonym拘置こうちFormalFormal. Confining suspects, defendants, or convicted inmates in a 「拘置所」; 「留置」 usually means police holding at a station and can also cover detaining objects.
• Synonym拘留こうりゅうFormalFormal. In everyday use, holding someone after capture; legally a short penalty of one day or more but under thirty. 「留置」 is investigation-stage holding, not a penalty.
• Synonym抑留よくりゅうFormalFormal. Holding foreigners or ships in custody, as in 「シベリア抑留」, or relatively short physical restraint; 「留置」 is mostly for domestic criminal investigation.
• Synonym拘禁こうきんFormalFormal. The broadest legal umbrella for restricting personal freedom, covering 「留置」, 「勾留」, and serving sentences; 「留置」 is just the police-station stage.
• Synonym勾留こうりゅうFormalFormal. Court-ordered pre-trial detention to prevent flight or evidence tampering; the detainee may still be held in a police facility, so 「勾留」 and 「留置」 often connect.
• Synonym検束けんそくWrittenWritten. Forcibly restraining someone so they cannot move freely; once preventive police restraint, now rare, with a self-restraint sense too. 「留置」 is the current term.
• Related禁錮きんこFormalFormal. A post-sentence penalty: imprisonment without forced labor, now merged with 「懲役」 into the combined 「拘禁刑」. 「留置」 is holding before any judgment.
• Related投獄とうごくWrittenWritten. Putting someone into prison, stressing the act of entering; common in narration and news reports. 「留置」 means holding at a police station, not a prison.
• Related幽閉ゆうへいWrittenWritten. Shutting someone inside a closed space, mostly in stories and historical accounts, often unlawfully. 「留置」 is lawful police detention.
• Related閉じ込めるとじこめるNeutralNeutral everyday verb: shutting a person or thing in so it cannot get out, as in 「部屋に閉じ込める」, in any setting. 「留置」 is police detention or impounding objects.
• Related収監しゅうかんFormalFormal. Committing someone whose sentence is final to a penal institution to serve it. 「留置」 is investigation-stage holding at a police station, not serving a sentence.
• Related押し込めるおしこめるNeutralNeutral everyday verb: forcing a person or thing into a place and shutting it in, not limited to legal contexts. 「留置」 is police holding a suspect or impounding objects.
• Related禁獄きんごくWrittenWritten. An old-fashioned word for locking someone in a jail, rarely used today. For holding a suspect say 「留置」; for imprisonment after sentencing, 「収監」 and the like.
• Related身柄拘束みがらこうそくWrittenWritten. Loss of freedom from police arrest and the like, common in news; stresses the person being controlled. 「留置」 is the later state of being held at the station.
• Related幽囚ゆうしゅうWrittenWritten. An archaic literary word for imprisonment or a prisoner, rarely seen today. For police holding a suspect, say 「留置」, never 「幽囚」.
• Antonym解放かいほうNeutralNeutral. Removing restraints to set someone free, in wide use, including hostages being freed; opposite to 「留置」 in the matter of physical restraint.
• Antonym釈放しゃくほうFormalFormal. Releasing someone in custody, as in 「容疑者を釈放する」; it marks the end of 「留置」 and is its most direct antonym.

Use 「留置」 for police holding a suspect at the station during investigation, or impounding objects. Court-ordered pre-trial detention is 「勾留」; once the sentence is final, 「収監」; release is 「釈放」. 「拘置」 covers holding in a 「拘置所」, 「拘禁」 is the broadest umbrella, and 「抑留」 is for foreigners or ships. For everyday 'shut in', use 「閉じ込める」 or 「押し込める」; the rest are written, legal, or archaic terms.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 留め置とめおくこと。
2. 物ものを支配下しはいかに留め置とめおくこと。
3. 罪つみをおかした疑うたがいのある者ものを警察署けいさつしょに拘束こうそくして留め置とめおくこと。