Noun
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any 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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a series of actions advancing a principle or tending toward a particular end
"he supported populist campaigns"
"they worked in the cause of world peace"
"the team was ready for a drive toward the pennant"
"the movement to end slavery"
"contributed to the war effort"
Verb
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go on a crusade
fight a holy war
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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
"The liberal party pushed for reforms"
"She is crusading for women's rights"
"The Dean is pushing for his favorite candidate"