He struck a blow against slavery.是什么意思？

He struck a blow against slavery.

他反对奴隶制度。

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

struck

v. 打（ strike的过去式和过去分词 ），击打，攻击，侵袭；

例句
He was struck by the artists' total absorption in their work.
他被艺术家对创作的全身心投入所打动。

blow

n. 殴打，打击，吹风，一阵风，意外的灾害，吹奏（声）；vt.& vi. （风）吹，（轮胎等）爆炸；vt. 吹，吹气，使爆炸，奏出，演奏，使气喘；vi. 吹刮，吹动，随风飘动，鸣叫，喘气；

例句
I think the decision was a bitter blow from which he never quite recovered...
我想这个决定对他是个沉重的打击，从此以后他一蹶不振。

against

prep. 反对，对…不利，紧靠，以防；

例句
His hand brushed against hers; it could have been either accidental or deliberate.
就在有意无意间，他的手轻轻拂过她的手。

slavery

n. 奴隶身份，奴隶制度，苦役，奴隶般的劳动，奴役，束缚，屈从，耽迷（酒色等）；

例句
...the abolition of slavery in Brazil and the Caribbean.
巴西及加勒比地区奴隶制的废除