also: けつばん · ちばん
noun, noun or participle which takes 'suru'
blood seal; sealing with blood
Historical practice of pressing a bloody fingerprint or palm print onto a document as a solemn oath or pledge. Often associated with vows, loyalty oaths, or dramatic promises in period stories.
彼らは誓いの証として血判を押した。
They pressed a blood seal as proof of their oath.
時代劇では、よく血
Blood-sealed letters often appear in period dramas.