名詞 crusade:

1. a series of actions advancing a principle or tending toward a particular end
   同義詞：campaign, cause, drive, movement, effort
2. 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

動詞 crusade:

1. 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
   同義詞：fight, press, campaign, push, agitate
2. go on a crusade; fight a holy war

1. The crusade for sexual morality is turning into a witch-hunt.
   捍衛(wèi)性道德的運(yùn)動正在轉(zhuǎn)化成對持異議人士的迫害。
2. Her commitment to a great cause degenerated from a crusade into an obsession.
   她致力於一偉大事業(yè)，但其崇高的奮斗精神已變質(zhì)成為偏執(zhí)的狂熱。
3. It's a crusade against corruption.
   這是一場反腐敗的運(yùn)動。
4. The college students are active to crusade against the nuclear weapons.
   大學(xué)生們積極投入開展反對核武器的運(yùn) 動。

cru.sade

n.（名詞）
Often Crusade Any of the military expeditions undertaken by European Christians in the th, 2th, and 3th centuries to recover the Holy Land from the Moslems.
常作 Crusade 十字軍遠(yuǎn)征：在、2或3世紀(jì)歐洲的基督教徒為了從穆斯林手中收復(fù)圣地而發(fā)動的軍事遠(yuǎn)征
A holy war undertaken with papal sanction.
圣戰(zhàn)：經(jīng)教皇認(rèn)可而發(fā)動的神圣戰(zhàn)爭
A vigorous concerted movement for a cause or against an abuse.See Synonyms at campaign
圣戰(zhàn)：贊成某一事業(yè)或反對某一弊病而進(jìn)行的有力的統(tǒng)一運(yùn)動參見 campaign
v.intr.（不及物動詞）
cru.sad.ed,cru.sad.ing,cru.sades
To engage in a crusade.
參加十字軍遠(yuǎn)征

來源：
French croisade
法語 croisade
Spanish cruzada
西班牙語 cruzada
both ultimately from Latin crux cruc- [cross]
都最終源自 拉丁語 crux cruc- [十字架]

【引伸】
crusad.er
n.（名詞）