With a violent movement, he shook his attacker off his back.是什么意思？

With a violent movement, he shook his attacker off his back.

他猛一使劲, 甩掉了背上的攻击者。

with

prep. 和，跟，随着，关于，和…一致；

例句
A waiter entered with a tray...
侍者端着托盘进来了。

violent

adj. 暴力引起的，剧烈的，（风，爆炸等）猛烈的，狂暴的，感情强烈的，颜色强烈的；

例句
He became violent and abusive toward Ben's mother...
他对本的妈妈动起粗来。

movement

n. 运动，活动，动作，举动，乐章；

例句
...the Adagio movement of his Sixth Symphony.
他的《第六交响乐》的慢板乐章

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。

shook

v. 摇撼( shake的过去式 )，（使）颤抖，握手，动摇；

例句
Clark shook hands with the pilot and walked aft to find his way off the ship.
克拉克与舵手握手后向艉部走去，打算下船。

his

pron. (he的所有格)他的，(he的物主代词)他的东西；det. 属于他的，用于名词前，自己的，指某人的，上帝的；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

attacker

n. 攻击者，进攻者，抨击者，（球类比赛的）攻击手；

例句
There were signs that she struggled with her attacker before she was repeatedly stabbed.
有迹象表明，在她被连刺数刀前，曾与袭击者进行过搏斗。

off

prep. 从…落下，离开，从…去掉，下班；adv. 离开，距，离，被取消，下班；adj. 不新鲜的，不能接受，不礼

例句
He eased his foot off the accelerator.
他松开了油门。

back

n. 背，背部，背面，反面，后面，后部，（椅子等的）靠

例句
He looked back at the abject, silent girl and repeated his question.
他转过头看着这个噤若寒蝉的女孩，又重复了一遍他的问题。