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verbexert oneself continuously, vigorously, or obtrusively to gain an end or engage in a crusade for a certain cause or person; be an advocate for
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nouna series of actions advancing a principle or tending toward a particular endtype of:
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nounany of the more or less continuous military expeditions in the 11th to 13th centuries when Christian powers of Europe tried to recapture the Holy Land from the Muslims
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verbgo on a crusade; fight a holy wartype of: