Quick definitions from WordNet (Crusade)
▸ noun: any of the more or less continuous military expeditions in the 11-13th centuries when Christian powers of Europe tried to recapture the Holy Land from the Muslims
▸ noun: a series of actions advancing a principle or tending toward a particular end
▸ verb: exert oneself continuously, vigorously, or obtrusively to gain an end or engage in a crusade for a certain cause or person; be an advocate for
▸ verb: go on a crusade; fight a holy war
▸ Also see crusade
▸ noun: any of the more or less continuous military expeditions in the 11-13th centuries when Christian powers of Europe tried to recapture the Holy Land from the Muslims
▸ noun: a series of actions advancing a principle or tending toward a particular end
▸ verb: exert oneself continuously, vigorously, or obtrusively to gain an end or engage in a crusade for a certain cause or person; be an advocate for
▸ verb: go on a crusade; fight a holy war
▸ Also see crusade