off

• 表示未运行、关掉或远离某处的状态；例如“灯关了”。

Primarily an adverb or preposition, ‘off’ can function as an adjective meaning not operating, deactivated, or away from a place (e.g., ‘the lights are off’).

1. Not operating / turned offA1formal

   Not switched on; not in operation.

   关闭的 / 关掉的

   • The lights are off.
   • Please make sure the stove is off before you leave.
   • The computer went off after the power outage.

   同义词disconnectedinactiveout

   反义词activeconnectedliveonoperationalpoweredrunningworking

2. Removed, away, distantA2informal

   Separate from or removed; not present at a place.

   离开的，远离的

   • He was off on a business trip all week.
   • She’s off for the weekend, so we can’t meet today.
   • The cat went off to hide under the bed.

   同义词absentawayelsewheregoneout

   反义词attachedonpresent

3. Not on the subject / irrelevantA2informal

   Deviating from the main topic; unrelated.

   离题

   • Your comment is off‑topic for this discussion.
   • Sorry, I’m getting a bit off my point.
   • Let’s try to stay on track and not go off about unrelated issues.

   同义词extraneousimpertinentinappositeirrelevantunrelated

   反义词applicablegermaneonpertinentrelevant

4. Spoiled, not fresh (food, drink)A2informal

   Having gone bad; unsuitable for consumption.

   变质的，不新鲜的

   • The milk smells off; throw it away.
   • Those mushrooms look a bit off; I wouldn’t eat them.
   • He said the cheese tasted off after being left out.

   同义词badrancidrottensourspoiledstaleturned

   反义词freshgood

5. Inappropriate, offensive (slang)B2slangamerican

   Suggestive of something indecent, rude, or disturbing.

   不当的，冒犯的（俚语）

   • That joke was really off‑color.
   • She made an off comment that upset everyone.
   • The comedian’s off remarks got the audience’s attention for the wrong reasons.

   同义词crudedirtydisturbinginappropriateindecentlewdoffensiveraunchyrudevulgar

   反义词appropriatedecentproper

• 副词，表示远离某地或某位置，指分离、脱离或距离。也用于复合动词中表示停止、关闭或取消，例如“turn off”（关掉）。

An adverb meaning 'away from a place or position', indicating separation, removal, or distance. It is also used in phrasal verbs to express cessation or cancellation, e.g., 'turn off'.

1. Not operating / turned offA1formal

   In a state of being switched off or not functioning.

   关闭 / 未运行

   • The lights are off.
   • Please make sure the computer is off before you leave.
   • The TV has been off all afternoon.

   同义词downinactiveout

   反义词activefunctioningonoperationalrunning

2. Away from a surface or positionA1informal

   Moving away from or down from a place, surface, or position.

   离开表面或位置

   • He jumped off the wall.
   • The cat leapt off the couch and ran outside.
   • She fell off the bike and scraped her knee.

   同义词asideawaydownout

   反义词ononto

3. Begin a journey or activityA2informal

   To start moving, traveling, or beginning an action.

   开始旅程或活动

   • They set off early in the morning.
   • We’ll set off for the mountains at dawn.
   • She set off on her career after graduation.

   同义词forthout

4. Cancelled / not happeningA2informal

   Used to say that an event or plan will not take place.

   取消 / 不举行

   • The meeting is off tomorrow.
   • The concert was off because of the storm.
   • Our dinner plans are off for now.

   同义词cancelledscrubbed

   反义词on

5. Incorrect / not accurateB1slangamerican

   Used informally to indicate that something is wrong or not precise.

   不正确 / 不准确

   • Your estimate is a bit off.
   • The thermometer reads off by a few degrees.
   • His timing was off during the performance.

   同义词amissaskewerroneousfaultyflawedimpreciseinaccurateincorrectinexactmistakenwrong

• 表示离开表面或位置的介词，也表示远离、从某处、靠近某地、停止使用或从总数中扣除。

A phrasal preposition used to indicate movement away from a surface or position, removal or separation from something, proximity to a location, cessation of use or consumption, or deduction from an amount.

1. Movement away from a surface or positionB1formal

   Used to indicate downward or outward movement from a place, position, or surface, often implying separation or distance in space or time.

   离开，从…下来，脱离

   • I fell off the ladder.
   • Keep off the grass!
   • He fell off his bike.
   • They were still 100 metres off the summit.

2. Removal or separation from somethingB1formal

   Used with actions in which something is removed, detached, or taken away from another object, surface, or person.

   从……上取下，脱离

   • You need to take the top off the bottle first!
   • I want about an inch off the back of my hair.
   • Has anyone taken a book off my desk?
   • Take your feet off that seat!

3. Proximity or location near to somethingB2formal

   Used to indicate that something is situated near, adjacent to, or leading away from a particular place, road, or area.

   在附近，靠近，偏离

   • We live off Main Street.
   • There's a bathroom off the main bedroom.
   • It's an island off the east coast of Spain.
   • He lives just off the main road.

4. No longer consuming, using, or liking somethingB2informal

   Used to indicate that someone has stopped eating, drinking, taking, or enjoying something they previously used or liked.

   不再吃、不再喝、不再喜欢

   • I'm off alcohol for a week.
   • He's finally off drugs.
   • She's been off coffee since her pregnancy.
   • I've gone off seafood after I was sick.

5. Deduction or reduction from an amountB1formalbusiness

   Used to indicate that a sum of money, quantity, or value has been subtracted or discounted from an original total.

   减去，折扣

   • They knocked £500 off the car.
   • There's 40 percent off this week on all winter coats.
   • I'll knock £20 off if you pay by cash.
   • You can get some money off if you pay cash.

6. Source or origin (informal)B2informal

   Used informally to indicate the person, place, or thing from which something was obtained or received.

   从…得到，来自，出自

   • I got this off a website somewhere.
   • I got it off my brother.
   • She heard the news off a friend.

• 动词（多用于非正式场合），意为杀死或除掉某人/某物；也可不带宾语，表示离开或停止运作。

A verb (mostly informal) meaning to kill or eliminate someone or something; also used intransitively to indicate departure or cessation.

1. Turn off / deactivateA1formal

   To cause a device, machine, or system to stop operating or to switch it to a non‑running state.

   关闭 / 停用

   • Please off the lights when you leave the room.
   • He offed his computer after finishing the work.
   • She forgot to off the stove and the kitchen filled with smoke.

   同义词cutdeactivatedisablekillshut offswitch offturn off

   反义词activateonstart

2. Kill (slang)B2slangbritish

   To kill or murder someone; often used in informal or criminal contexts.

   干掉（俚语）

   • The hitman was hired to off the target.
   • In the movie the hero has to off the villain before he escapes.
   • The mobster ordered his men to off anyone who talked.

   同义词bump offdispatchhiticerub outsmoketake outwastewhack

3. Cancel or abortB2informal

   To cancel, postpone or stop an event, appointment, or plan.

   取消或中止

   • We had to off the meeting because the presenter was sick.
   • The airline offed the flight due to bad weather.
   • She offed her dinner plans after getting a call from work.

   同义词abortaxecall offcanceldropnixscrapscrub

   反义词arrangeconfirmplanschedule

4. Discount / reduce priceB1informalamericanbusiness

   To make a reduction in price; to mark something as cheaper.

   降价

   • The store is off 20 % on all winter coats.
   • They offed the price after the product didn’t sell well.
   • You can off the subscription fee if you sign up for a year.