1.scrub的基本意思是“擦净”,指用刷子、布、毛巾或水、酒精等擦拭某物体以使之干净。引申可表示“用刷子刷净”“对…不予考虑”“取消”“剔除”等。
2.scrub用作及物动词时,可接名词、代词作宾语,也可接由形容词充当补足语的复合宾语。用作不及物动词时,多与介词或副词连用。
3.scrub和副词away、down、off、out连用时,其宾语可指被擦的物体,也可指擦掉的东西。
4.scrub的过去式和过去分词均为scrubbed。

scrub away(v.+adv.)
不停地擦〔刷〕,反复地擦〔刷〕 rub continuously or repeatedly
▲scrub away
After scrubbing away for half an hour,I still couldn't get the mark off.我一直擦了半个小时,仍没把这个痕迹擦掉。
He's down on his knees, scrubbing away.他跪在地板上,不停地擦洗着。
▲scrub sth⇔away
Don't rub too hard with your cleaning brush or you could scrub the paint away!不要用刷子猛刷,否则你会把油漆刷掉的。

scrub down(v.+adv.)
擦〔刷〕干净 clean sth by rubbing
▲scrub sth⇔down
Would you like me to scrub your back down?我给你擦擦背好吗?
Scrub the walls down well before painting them.上油漆前要彻底把墙壁刷干净。

scrub off(v.+adv.)
洗掉 wash off
▲scrub off
I got paint on my hands and it won't scrub off.我把油漆弄到了手上,洗也洗不掉。

scrub out(v.+adv.)
擦〔刷〕掉 remove sth by rubbing
▲scrub sth⇔out
Always scrub the tins out before using them again.重新使用食品罐前,一定要先把它们擦洗干净。
Can you scrub out that dirty mark on the wall?你能把墙上的那个污点刷掉吗?
Scrub out that last part of the message, the wording is not very polite.电文最后一部分用词不太礼貌,把它划掉。
◇ 用于be ～ed 结构
The football game had to be scrubbed out because of the snowstorm.由于暴风雪,足球赛只得被取消了。

scrub round(v.+adv.)
〈非正〉取消,停止 cancel or stop
▲scrub sth⇔round
So few people came that we decided to scrub round the meeting and try again next week.到会的人太少,我们决定不开会了,下星期再说。

用作及物动词
▲S+～+n./pron.
She's scrubbing the floor.她正在擦洗地板。
John scrubbed the top of the wooden table.约翰把桌子面擦净了。
He scrubbed many unnecessary words in his manuscript.他在他原稿上取消许多多余的词。
用作宾补动词
▲S+～+n./pron.+adj.
Have you scrubbed the pan clean?你把锅擦净了吗?
I have to scrub the walls clean on Saturday.星期六,我得把墙刷洗干净。

scrub还可用作名词,意思是“洗擦, 擦净; 灌木”。