If you go on a crusade against vegetables, you are waging a long-term battle against leafy greens. A crusade is a passionate struggle against something or someone.

In the 11th through 13th centuries, Roman Catholics attempting to win control of parts of what they considered the Holy Land (currently Israeli, Jordanian, Lebanese, and Palestinian lands) waged military battles against the Muslims who controlled the land. These battles are called the Crusades. The word crusade carries with it the feeling of a violent and vigorous fight. So if someone is on a crusade to do something, they mean business!

Definitions of crusade
  1. noun
    a series of actions advancing a principle or tending toward a particular end
    synonyms: campaign, cause, drive, effort, movement
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    ad blitz, ad campaign, advertising campaign
    an organized program of advertisements
    anti-war movement
    a campaign against entering or continuing a war
    charm campaign
    a campaign of flattery and friendliness (by a company, politician, etc.) to become more popular and gain support
    a movement advocating greater protection of the interests of consumers
    campaigning, candidacy, candidature, electioneering, political campaign
    the campaign of a candidate to be elected
    fund-raising campaign, fund-raising drive, fund-raising effort
    a campaign to raise money for some cause
    feminism, feminist movement, women's lib, women's liberation movement
    the movement aimed at equal rights for women
    gay lib, gay liberation movement
    the movement aimed at liberating homosexuals from legal or social or economic oppression
    lost cause
    a defeated cause or a cause for which defeat is inevitable
    a campaign aimed to correct abuses or malpractices
    a concerted campaign to end something that is injurious
    youth crusade, youth movement
    political or religious or social reform movement or agitation consisting chiefly of young people
    front-porch campaign, front-porch campaigning
    a campaign in which the candidate makes speeches but does not travel
    the activities involved in political campaigning (especially speech making)
    whispering campaign
    the organized dissemination of derogatory rumors designed to discredit a candidate
    campaigning for something by making political speeches (stump speeches)
    sales campaign
    an advertising campaign intended to promote sales
    public-relations campaign
    an advertising campaign intended to improve public relations
    type of:
    any venturesome undertaking especially one with an uncertain outcome
  2. noun
    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
    synonyms: Crusade
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    First Crusade
    a Crusade from 1096 to 1099; captured Jerusalem and created a theocracy there
    Second Crusade
    a Crusade from 1145 to 1147 that failed because of internal disagreements among the crusaders and led to the loss of Jerusalem in 1187
    Third Crusade
    a Crusade from 1189 to 1192 led by Richard I and the king of France that failed because an army torn by dissensions and fighting on foreign soil could not succeed against forces united by religious zeal
    Fourth Crusade
    a Crusade from 1202 to 1204 that was diverted into a battle for Constantinople and failed to recapture Jerusalem
    Fifth Crusade
    a Crusade under papal control from 1218 to 1221 that achieved military victories but failed when dissension arose over accepting the terms they had been offered
    Sixth Crusade
    a Crusade from 1228 to 1229 led by the Holy Roman Emperor Frederick II who fell ill and was excommunicated by the Pope; by negotiation Frederick II was able to crown himself king of Jerusalem
    Seventh Crusade
    a Crusade initiated in 1248 after the loss of Jerusalem in 1244 and defeated in 1249
    type of:
    expedition, hostile expedition, military expedition
    a military campaign designed to achieve a specific objective in a foreign country
  3. verb
    go on a crusade; fight a holy war
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    type of:
    campaign, take the field
    go on a campaign; go off to war
  4. verb
    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
    “She is crusading for women's rights”
    synonyms: agitate, campaign, fight, press, push
    advertise, advertize, promote, push
    make publicity for; try to sell (a product)
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    type of:
    advertise, advertize, promote, push
    make publicity for; try to sell (a product)
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