Refers to a forced march of prisoners or captives under harsh conditions, often resulting in death. Also used metaphorically for an exhausting, relentless task or project.
捕虜たちは死の行進を強いられた。
The prisoners of war were forced on a death march.
このプロジェクトはまさに死の行進だ。
This project is truly a death march.
Compound of 死 (し, 'death') + の (possessive particle) + 行進 (こうしん, 'march'). The term is a direct translation of the English 'death march' and is used in both historical and figurative contexts.