defend
词根词缀：
defend v. 保卫
de 加强 + fend 打击 → 保卫
defense n. 保卫
de 加强 + fens 打击 + e → 保卫
defenseless adj. 无防备的
defense 保卫 + less 无…的 → 无防备的
fend v. 抵挡，击退
offend v. 得罪
of〔= ob 加强〕+ fend 打击 → 一再打击〔别人〕→ 得罪
offender n. 罪犯；冒犯者
offend 得罪 + er 表名词 → 罪犯；冒犯者
offensive adj. 冒犯的
of 加强 + fens 打击 + ive …的 → 冒犯的
数据来源：新东方英语词汇速记大全
相关例句：
In 1991 he and his friends defended themselves against some white racist thugs who set upon them for no other reason than their skin colour.
1991年，他和朋友在面对几个仅仅因为肤色就攻击他们的白人种族主义暴徒时奋起自卫。
He has hired a lawyer to defend him against the allegations
他已聘请了一位律师针对这些指控为自己辩护。
Now that you are able to take up arms and defend your motherland, we are all proud of you.
你现在能够披坚执锐，保卫祖国，我们都为你感到自豪。
Now we stand on the moral high ground. We can defend ethically and morally everything we stand for.
目前我们在道义上占了优势。我们可以从伦理和道德的角度捍卫我们主张的一切。
Black communities spoke up to defend the rights of all people of color.
黑人群体大声疾呼，要求维护有色人种的权利。
The author defends herself against charges of racism by noting that blacks are only one of her targets
面对种族主义指控，作者替自己辩护说黑人只是她的抨击目标之一。