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Definition of crusade verb from the Oxford Advanced Learner's Dictionary

crusade

verb
 
/kruːˈseɪd/
 
/kruːˈseɪd/
[intransitive]
Verb Forms
present simple I / you / we / they crusade
 
/kruːˈseɪd/
 
/kruːˈseɪd/
he / she / it crusades
 
/kruːˈseɪdz/
 
/kruːˈseɪdz/
past simple crusaded
 
/kruːˈseɪdɪd/
 
/kruːˈseɪdɪd/
past participle crusaded
 
/kruːˈseɪdɪd/
 
/kruːˈseɪdɪd/
-ing form crusading
 
/kruːˈseɪdɪŋ/
 
/kruːˈseɪdɪŋ/
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  1. to make a long and determined effort to achieve something that you believe to be right or to stop something you believe to be wrong synonym campaign
    • a crusading environmentalist
    Word Originlate 16th cent. (originally as croisade): from French croisade, an alteration (influenced by Spanish cruzado) of earlier croisée, literally ‘the state of being marked with the cross’, based on Latin crux, cruc- ‘cross’; in the 17th cent. the form crusado, from Spanish cruzado, was introduced. The blending of these two forms led to the current spelling, first recorded in the early 18th cent.
See crusade in the Oxford Advanced American Dictionary

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