crusade
/kruˈseɪd/
noun
- A long and determined effort to achieve something, especially a moral or social change.
- His crusade for better schools won community support.
- She led a crusade to clean up the local park.
- The organization started a crusade against plastic waste.
- Any of the military expeditions undertaken by European Christians in the 11th–13th centuries to recover the Holy Land from Muslims.
- The Crusades had a lasting impact on relations between Europe and the Middle East.
- The history class studied the causes of the First Crusade.
- Many knights joined the Crusade in hopes of adventure.