off 既是副词形容词也是介词

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off
off / ɔf; NAmE ɔːf; ɑːf /
adverb
HELP  For the special uses of off in phrasal verbs, look at the entries for the verbs. For example come off is in the phrasal verb section at come.
   off 在短语动词中的特殊用法见有关动词词条。如 come off 在词条 come 的短语动词部份。

1. away from a place; at a distance in space or time
   离开(某处)；(在时间或空间上)距,离:
   I called him but he ran off.
   我喊他,可他跑开了。
   Sarah's off in India somewhere.
   萨拉远在印度某地。
   I must be off soon (= leave).
   我必须很快离开这里。
   Off you go!
   你走吧！
   Summer's not far off now.
   夏天已近在咫尺了。
   A solution is still some way off.
   解决办法尚需时日。
2. used to say that sth has been removed
   (用以表示除去了某物):
   He's had his beard shaved off.
   他把胡子刮光了。
   Take your coat off.
   脱了外衣吧。
   Don't leave the toothpaste with the top off.
   用完了牙膏别让盖子开着。
3. starting a race
   起跑:
   They're off (= the race has begun).
   他们起跑了。
4. no longer going to happen; cancelled
   不再会发生；被取消:
   The wedding is off.
   婚礼被取消了。
5. not connected or functioning
   未连接；不工作:
   The water is off.
   停水了。
   Make sure the TV is off.
   请注意关掉电视机。
6. (especially BrE) (of an item on a menu 食谱中的项目) no longer available or being served
   没有；不再供应:
   Sorry, the duck is off.
   对不起,鸭子卖光了。
7. away from work or duty
   下班；休息:
   She's off today.
   她今天休假。
   I've got three days off next week.
   我下周有三天休假。
   How many days did you take off ?
   你休了几天假？
   I need some time off.
   我需要休息一段时间。
8. taken from the price
   减价的；削价的:
   shoes with $20 off
   减价 20 元的鞋
   All shirts have / are 10% off.
   衬衣全部减价 10%。
9. behind or at the sides of the stage in a theatre
   在剧院舞台的后面(或旁边)
   SYN  offstage
IDIOMS
▪ be well / better / badly, etc. 'off
   used to say how much money sb has
   (用于表示经济情况):
   Families will be better off under the new law (= will have more money).
   这项新法律将使每个家庭的经济较前宽裕。
   They are both comfortably off (= have enough money to be able to buy what they want without worrying too much about the cost).
   他们俩的生活都很宽裕。
▪ be better / worse off (doing sth)
   to be in a better or worse situation
   (做某事)会较好/较糟:
   She's better off without him.
   他不在身边她反倒更快乐。
   The weather was so bad we'd have been better off staying at home.
   天气太糟了,我们要是待在家里就好了。
   We can't be any worse off than we are already.
   我们的状况已经糟得不能再糟了。
▪ be ˌoff for 'sth    (informal) to have a particular amount of sth
   有一定数量的东西:
   How are we off for coffee (= how much do we have) ?
   我们还有多少咖啡？
⇨ see also badly off
▪ ˌoff and 'on / ˌon and 'off
   from time to time; now and again
   不时地；经常；断断续续地:
   It rained on and off all day.
   雨断断续续地下了一整天。

preposition
HELP  For the special uses of off in phrasal verbs, look at the entries for the verbs. For example take sth off sth is in the phrasal verb section at take.
   off 在短语动词中的特殊用法见有关动词词条。如 take sth off sth 在词条 take 的短语动词部份。

1. down or away from a place or at a distance in space or time
   从(某处)落下；离开；(时空上)离,距:
   I fell off the ladder.
   我从梯子上跌了下来。
   Keep off the grass!
   勿践踏草坪！
   an island off the coast of Spain
   西班牙海岸附近的岛
   They were still 100 metres off the summit.
   他们距山顶还有 100 米远。
   Scientists are still a long way off finding a cure.
   科学家要找到一个治疗方法,还远着呢。
   We're getting right off the subject.
   我们完全离题了。
2. leading away from sth, for example a road or room
   离开；偏离:
   We live off Main Street.
   我们住在大街附近。
   There's a bathroom off the main bedroom.
   主卧室旁边有一个衞生间。
3. used to say that sth has been removed
   从…去掉；从…移开:
   You need to take the top off the bottle first!
   你得先把瓶盖子打开！
   I want about an inch off the back of my hair.
   我想把脑后的头发剪短约一英寸。
4. away from work or duty
   下班；休息:
   He's had ten days off school.
   他有十天没上学了。
5. away from a price
   偏离…价格；削价；杀价:
   They knocked £500 off the car.
   他们对这辆汽车杀价 500 英镑。
6. off of (non-standard or NAmE, informal) off; from
   离开；来源于；从:
   I got it off of my brother.
   这是我从我弟弟那里弄到的。
7. not wanting or liking sth that you usually eat or use
   不想；戒除:
   I'm off (= not drinking) alcohol for a week.
   我有一星期没喝酒了。
   He's finally off drugs (= he no longer takes them).
   他终于把毒戒了。

adjective [not before noun]
1. (of food 食物) no longer fresh enough to eat or drink
   不新鲜；变质:
   This fish has gone off.
   这条鱼已变质了。
   The milk smells off.
   这奶的味道不对劲。
   It's off.
   那东西坏了。
2. ~ (with sb) (informal, especially BrE) not polite or friendly
   不礼貌；不热情；冷淡:
   He was a bit off with me this morning.
   他今天早晨对我有点冷淡。
3. (informal, especially BrE) not acceptable
   不能接受；难以容忍；不行:
   It's a bit off expecting us to work on Sunday.
   让我们星期天上班工作,那可不太行吧。

注意：off 还可以用作名词和动词，虽然这些用法并不常见。
noun [sing.]
   the off the start of a race
   起跑:
   They're ready for the off.
   他们准备起跑了。

verb [VN]
   (informal, especially NAmE) to kill sb
   杀死(某人)