To make a grand concerted effort toward some purportedly worthy cause.
Origin
From French croisade, introduced in English (in the French spelling) by 1575. The modern spelling emerges . Middle French croisade is introduced in the 15th century, based on Spanish cruzada (late 14th century) and Old Occitan crozada (early 13th century), both reflecting , cruxiata, the feminine singular of the adjective cruciātus used as an abstract noun.
Adjectival cruciātus originally meant "tormented; crucified", but from the 12th century was also used for "marked with a cross; making the sign of the cross" and eventually "taking the cross" in the sense of "going on a crusade".
Old Occitan crozada is used in the sense "[the Albigensian] crusade" in the Song of the Albigensian crusade, written c. 1213. From vernacular usage, Middle Latin cruciāta also comes to be used in the sense "crusade" from about 1270.
Modern English dictionary
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