noun
holy war; crusade
Refers to a war fought for religious reasons, or metaphorically for a cause pursued with religious-like zeal. Often used in historical or rhetorical contexts.
中世ヨーロッパでは、聖戦が何度も行われた。
In medieval Europe, holy wars were fought many times.
彼は環境保
He speaks of environmental protection as if it were a crusade.