1.sack用作名词时意思是“袋”,转化为动词意为把某物“装入袋中”,引申可表示“洗劫”“开除”等。
2.sack一般只用作及物动词,接名词或代词作宾语。作“开除”解时,常用于被动结构,用for引出被开除的原因。
3.sack在美国俚语里有时也可用作不及物动词,常与in或out连用表示“上床睡觉”,较粗俗。

sack for(v.+prep.)
因…而解雇(某人) fire (sb) because of (sth)
▲sack sb for sth
◇ 常用于be ～ed结构
One of the workers was sacked for drunkenness.一名工人因醉酒而被炒鱿鱼。
She was sacked for incompetence.她因不称职而被解雇。

sack in〔out〕(v.+adv.)
〈美口〉上床睡觉 go to sleep
〔说明〕 sack in/out常不用于进行体。
▲sack in〔out〕
Where did you sack in last night?昨晚你们在哪儿睡觉的?
Where are you going to sack out?你们准备去哪里好好睡一觉?

sack up(v.+adv.)
〈美口〉获取利润 gain a profit
〔说明〕 sack up常不用于进行体。
▲sack up
How much did we sack up this time?这次我们获得多少利润?

用作及物动词
▲S+～+n./pron.
The old lady was sacking the rice.那位老妇人在装大米。
I got hired one summer to sack grain.有一年夏季,我受雇替人把粮食装袋。
They were sacking the potatoes in the field.他们正在地里把土豆装袋。
The invaders sacked the city.侵略者把这座城市洗劫一空。
The boss sacked a dilatory worker yesterday.昨天老板开除了一个凡事都爱拖延的人。
◇ 用于be ～ed结构
All my books were sacked and sent to London.我的书都装在袋子里寄到伦敦去了。
Thousands of people were killed when the town was sacked.该镇被劫掠之时,成千上万的人惨遭杀害。
Facer was sacked five days ago.费塞五天前被解雇了。
Three railwaymen were sacked because they would not join a union.三名铁路工人因不愿加入工会而被解雇。

［词源］＜古英语sacc(袋)

sack可用作单位词,如果sack of修饰不可数名词,则只需将sack变成复数形式; 如果修饰可数名词,则名词要变成复数形式, sack也要变成复数形式。sack of前还可有数词和不定冠词a修饰。

Coal used to cost 3 shillings a sack.以往一袋煤值三先令。
There are many sacks of corn.有许多袋玉米。
He bought a sack of potatoes.他买了一袋土豆。
I bought three sacks of rice.我买了三袋米。
He got the sack for petty thieving.他因小偷小摸而被开除了。
The invaders put all to the sack.入侵者把所有的东西洗劫一空。

sack, bag
参见bag条。