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English definition of “crusade”

crusade

noun uk   /kruːˈseɪd/ us  
[C] a long and determined attempt to achieve something that you believe in strongly: They have long been involved in a crusade for racial equality. a moral crusade against drugs [C often plural] (also Crusade) a war fought by Christians against Muslims, often in Palestine, in the 11th, 12th, 13th, and 17th centuries

crusade

verb [I] uk   /kruːˈseɪd/ us  
to make an effort to achieve something that you believe in strongly: She crusaded against sex and violence on television.
crusader
noun [C] uk   /-ˈseɪ.dər/ us    /-ˈseɪ.dɚ/
He caught the public imagination as a crusader against corruption.
(Definition of crusade from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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