1. a series of religious wars fought by European Christians against Muslims in the Middle Ages to recover the Holy Land
Usage: historical
2. vigorous campaigns for a cause or against something perceived as wrong

Examples

• The Crusades lasted from the 11th to the 13th centuries.
• Many knights joined the Crusades believing they were fighting for God.
• The First Crusade successfully captured Jerusalem in 1099.
• She led crusades against poverty in her community.
• The organization launched crusades for environmental protection.
• His crusades for social justice inspired many followers.
• The mayor’s crusades against corruption won public support.