1. any of the military expeditions undertaken by Christian powers in the 11th, 12th, and 13th centuries to recover the Holy Land from the Muslims
Usage: historical
2. a vigorous campaign for political, social, or religious change

1. to lead or take part in a vigorous campaign for a cause or against something

Examples

• The First Crusade began in 1096.
• Richard the Lionheart led the Third Crusade.
• She launched a crusade against drunk driving.
• The senator crusaded for healthcare reform.
• They joined the crusade to save the environment.
• He crusaded tirelessly against corruption in government.
• The organization’s crusade for animal rights gained national attention.