供述

1. Origins, structure, and basic meaning

• Structure: 供述 is read as きょうじゅつ and functions as a noun or with する for a suspect's or witness's formal statement in an investigative or legal context.
• Basic usage: Mark the stated matter with を in 行動を供述する, and identify the speaker with の in 証人の供述.

2. Common pitfalls and similar expressions

• Act and content of a statement
  • 供述した describes giving the statement, while the 供述 compared with video is the content that was given.
• Scope beyond ordinary explanation
  • It is a formal term suited to investigative or testimonial settings, not merely any casual account of an experience.