基本介词ON补充词组
1. on a diet ** 节食，减肥
解 习语；词义溯源：在［饮食（diet）］方面
例 Even if you're on a diet, you can enjoy low-calorie chocolate.虽然你现在在节食，但是你依然可以尝尝低热量巧克力。
2. on a 〔the〕 waiting list ** 被列入等候名单
解 习语；词义溯源：在［等候名单（waiting list）］上
例 We're on the waiting list for a table at the restaurant. 我们在餐厅排队等位。
3. on account ** 赊账；分期付款
解 习语；词义溯源：在［信用账户（account）］上
例 You already have $5,670 on account and your credit limit is $5,000.你已经赊账用了5670美元，而你的信用卡限额只有5000美元。
4. on active duty ** 正在服役，现役
解 习语；词义溯源：处于［现役（active duty）］的状态
例 While on active duty, Sergeant Smith served in Germany, Egypt and Panama. 在服役期间，史密斯中士曾经在德国、埃及和巴拿马执行过任务。
5. on all fours ** 趴在地上，匍匐
解 习语；词义溯源：用［四肢（all fours）］
例 Jim's mother was on all fours cleaning the floor when we arrived. 我们到达的时候，吉姆的妈妈正趴在地上擦地板。
6. on and off / off and on ** 断断续续，时不时
解 习语；词义溯源：处于一会儿［进行（on）］一会儿又［中断（off）］的状态
例 It's been raining on and off all day long. 雨断断续续地下了一整天。
7. on approval ** 试用的；包换的
解 习语；词义溯源：正在［认可（approval）］
例 I'll send you the first shipment on approval. If our product doesn't satisfy your needs better than anything else, you don't have to pay for it. 我会给你寄去第一批货物供试用。如果我们的产品无法满足你的要求，那么你不需要付钱。
8. on board ** 在船上，在飞机上；支持的，赞同的
解 习语；词义溯源：在［甲板（board）］上
例 Fortunately an FBI agent was on board and shot the hijacker before he took control of the plane. 幸运的是，一名美国联邦调查局的探员正在飞机上，他在劫机犯控制飞机之前向他开了枪。
9. on cloud nine ** 心情愉悦；狂喜
解 〈口〉习语；词义溯源：处于上了［九重天（cloud nine）］的状态
例 Nancy's been on cloud nine for a week now. Ron asked her to marry him last weekend. 南希整整一周都兴高采烈的。罗恩上周末向她求婚了。
10. on dead center ** 在正中间；正确
解 习语；词义溯源：在［正中间（dead center）］；这里的dead表示“准确”
例 Place this poster on the south wall. And make sure it's on dead center.把这张海报贴到南边的墙上。一定要贴在正中间。
The broadcasting company will never admit it, but Mr. Edwards' criticism of the network is on dead center.广播公司永远不会承认，但是爱德华兹先生对网络的批评是中肯的。
11. on deck ** 在甲板上；（活动）做好准备的
解 习语；词义溯源：在［甲板（deck）］上
例 Captain Foster's arrival was announced with a loud “The captain is on deck!”福斯特船长到达时，有人高声宣布：“船长上船了！”
12. on deposit ** 储存，存（款）
解 习语；词义溯源：以［存款、储备金（deposit）］的形式
例 Rumors have it that the former President has hundreds of millions of dollars on deposit in secret Swiss bank accounts.有谣言说前总统在瑞士银行的秘密账户里面有数亿美元的存款。
13. on duty ** 执勤，值班；上班
解 习语；词义溯源：在［执勤（duty）］中；参照off duty
例 Nurse Jones? Oh, she's not on duty until four o'clock. Could you call back after four?琼斯护士？哦，她要到四点钟才上班。你能在四点之后再打过来吗？
14. on earth / in heaven / in the world ** 到底，究竟
解 习语；词义溯源：在［地上（earth）］；用在who、what、when、where、how、which等词后表示强调
例 John! What on earth are you doing? Why have you taken my computer apart? 约翰！你到底在做什么？你为什么把我的计算机给拆了？
15. on edge ** 竖着；紧张，忐忑不安
解 习语；词义溯源：在某物的［边缘（edge）］上
例 We're all on edge waiting for the company to announce how many workers it plans to lay off when merger is complete. 我们都紧张地等待着公司宣布在并购完成后，计划辞退多少名员工。
16. on foot ** 走路，徒步
解 习语；词义溯源：用［脚（foot）］走
例 Oh, you can go there on foot. It's just a couple of blocks down Madison Street. 哦，你可以步行去那里。那里离麦迪逊大街只有几个街区。
17. on good terms with sb. / on good terms ** 关系融洽
解 习语；词义溯源：与某人处于［关系好 （good terms）］的状态
例 Are you on good terms with anybody from Devon Chemicals? I need to get some information from them. 你跟德文化工的人有关系好的吗？我想从他们那里打听一些消息。
18. on hold ** 等候对方接电话；（工作、计划等）延迟
解 习语；词义溯源：处于［保留、持续（hold）］的状态
例 The poor performance of the company's stock has forced Andies Restaurants to put its planned expansion on hold while it seeks other financing options. 由于公司股票情况不佳，安迪斯餐厅只能暂停其扩张计划，寻找其他融资渠道。
19. on line ** 在线的，联机的
解 习语；词义溯源：在［线（line）］上
例 If you want to get on line, call me today!如果你想联机，今天给我打电话吧！
20. on no account / not on any account ** 决不
解 习语；词义溯源：没有［理由（account）］
例 You are not to go to John Pearson's house on no account!Don't go over there to do your homework, watch TV—nothing. Stay away from him.你决不能去约翰·皮尔逊家！不准去那里做作业、看电视——做什么都不行。离他远一点。
21. on occasion ** 偶尔；有时
解 习语；词义溯源：在某［时刻，场合（occasion）］
例 The library closes on occasion to take an inventory and do renovations. 图书馆有时候会关闭，进行盘点和更新。
22. on one's account ** 因为某人的利益或缘故
解 习语；词义溯源：由于某人的［原因、缘故（account）］
例 Peter left the gun where the boy could get it. So it is on his account that the boy accidentally shot himself. 彼得把枪放在了那个男孩可以够到的地方。所以就是因为他，那个男孩才会意外射伤自己。
23. on one's best behavior ** 守规矩，表现良好
解 习语；词义溯源：以［最好的行为（best behavior）］
例 Be on your best behavior. The man who is coming to dinner tonight is a very important client for your father. 你要表现好点。今天来吃晚饭的人是你父亲非常重要的客户。
24. on one's feet ** 站起来；（病后）恢复；（经济上）独立
解 习语；词义溯源：在［脚（feet）］上
例 Once I'm on my feet again, I plan to start writing my next novel. 一旦我身体恢复了，我就计划开始写我的下一本小说。
25. on one's head ** （责任、重担等）落到某人头上
解 习语；词义溯源：在某人的［头（head）］上；常与blame一起使用，on可用upon代替
例 Certainly some of the responsibility must fall on the president's head. 当然，部分责任一定要由总裁承担。
26. on one's honor ** 以名誉、人格担保
解 习语；词义溯源：以［荣誉（honor）］为条件
例 We didn't sign a contract. We just agreed to do it on our honor. 我们没有签合同。我们只是同意以名誉担保会这么做。
27. on one's mind ** 关心，惦记
解 习语；词义溯源：在［心头（mind）］上
例 The documentary I watched on TV last night has been on my mind all day. 昨晚在电视上看的纪录片今天一整天都萦绕在我的脑海中。
28. on one's own ** 独自，靠自己
解 习语；词义溯源：靠［自己（one's own）］的能力
例 Changing the oil in your car is easy. Why pay a mechanic to do it, when you can do it on your own? 给汽车换油非常简单。既然你可以自己做，为什么要花钱让机修工来做呢？
Tim's been on his own since his parents were killed in a car accident seven years ago. 自从父母在七年前的车祸中丧生之后，蒂姆一直自己生活。
29. on one's own time ** 在业余时间，闲暇时
解 习语；词义溯源：在［自己的时间（one's own time）］
例 If you want to talk with your boyfriend on the phone, Janet, I would appreciate it if you would do that on your own time—not while you're supposed to be working! 珍妮特，如果你想跟你男朋友打电话，我希望你能在业余时间打——别在工作时间打！
30. on one's say-so ** 听某人的话，得到某人的允许
解 习语；词义溯源：凭借某人的［指示、主张（say-so）］
例 On whose say-so did you decide to close the bank early? 你听了谁的意见，决定早关闭银行？
31. on one's toes ** 机警的，随时准备行动的
解 习语；词义溯源：在［脚趾（toes）］上
例 Be on your toes. The inspectors could show up anytime in the next week, so be prepared. 保持警惕。下周检查员随时都可能出现，所以要做好准备。
32. on one's way / on the way ** 在（去某处的）路上，途中
解 习语；词义溯源：在某人的［路（way）］上
例 It's no problem at all. The library is right on my way, so give me the books and I'll drop them off for you on the way home tonight. 没问题。我正好路过图书馆，把书给我吧，我今晚回家的路上帮你还了。
33. on order ** 已订购的
解 习语；词义溯源：在［订购（order）］中
例 We have two truckloads of paper on order. They are to be delivered on the 15th. 我们订购了两卡车纸。15号送到。
34. on pins and needles ** 如坐针毡
解 习语；词义溯源：在［别针和针（pins and needles）］上
例 I think the teacher enjoys seeing us on pins and needles. That's why he hasn't posted the results of the exam yet. He loves watching us wait with anticipation.我觉得老师喜欢看我们如坐针毡的样子。这也是他还没有公布考试结果的原因。他喜欢看到我们满怀期待地等待。
35. on record ** 记录在案，有记载
解 习语；词义溯源：在［记录（record）］上
例 We have all of your personal information on record already. So all you need to do is put your name on the application and sign it at the bottom.我们已经记录了你所有的个人信息。所以，你只需在申请表上写上你的名字，然后在下面签字。
36. on sale ** 便宜甩卖，廉价出售
解 习语；词义溯源：在［廉价出售（sale）］中
例 Let's go shopping at the supermarket. I heard everything is on sale these days. 我们去超市购物吧。我听说这几天所有商品都在促销。
37. on speaking terms with sb. / on speaking terms ** 友好；泛泛之交
解 习语；词义溯源：与某人处于［互相交谈的关系（speaking terms）］
例 Diane and I are on speaking terms again, but we're still not as friendly as we used to be. 黛安娜和我合好了，但是我们不像以前那么友好了。
38. on target ** 正中目标；切题；正确
解 习语；词义溯源：在［靶子（target）］上
例 If our marketing department predic-tion is on target, then we can expect to have excellent sales this summer. 如果营销部的预测是正确的，那么我们今年夏天应该会有很好的销量。
39. on the alert for sb. or sth. / on the alert ** 警惕，提防
解 习语；词义溯源：处于［警戒（alert）］某人或某事的状态
例 Residents in the area are advised to be on the alert for any suspicious activities. 这个地区的居民收到建议，要警惕任何可疑的活动。
40. on the ball ** 精明能干，机敏
解 习语；词义溯源：在［球（ball）］上
例 Don't worry about Jack. He's on the ball and will do a good job. 别担心杰克。他很机敏，肯定能干好的。
41. on the beam ** 正确；恰到好处
解 〈口〉习语；词义溯源：在［导航波束标明的航道（beam）］上；原为航空用语
例 Your ideas are not on the beam. I want you to reconsider them and rewrite this thesis once more. 你的想法不正确。我希望你再重新考虑一下，重写这篇论文。
42. on the bench ** 坐冷板凳；开庭审判
解 习语；词义溯源：在［椅子、长椅（beach）］上
例 Until your school grades improve, you will be on the bench no matter how good you are or how much the team needs you. 在你的学习成绩有所提高之前，不论你有多么优秀，也不论队伍多么需要你，你都不能上场比赛。
43. on the button ** 准确，确切
解 〈口〉习语；词义溯源：在［扣子（button）］上
例 Move your hand up, ...up again, ... over to the left, ...a little more...there! You are on the button!Hang the picture right there. 把手往上一点……再往上……往左……再往左一点……好！对了！就把图挂在那里吧。
44. on the contrary ** 正相反，反之
解 〈口〉习语；词义溯源：处于［相反（contrary）］的状态
例 This report says the demand for mobile HDDs is declining. On the contrary, our own studies show it is growing, especially in developing countries. 这份报告称对移动硬盘的需求正在下降。恰恰相反，我们自己的研究显示这种需求正在增长，尤其是在发展中国家。
45. on the face of it ** 从表面判断；乍一看
解 习语；词义溯源：在某物的［表面（face）］上
例 On the face of it, the missing money seemed nothing more than an accounting error, but once we started to investigate, we knew it was something much more serious. 表面看来，少了钱好像只是会计的失误，但是我们一开始调查才知道事情比这严重得多。
46. on the fence about sth. / on the fence ** 保持中立
解 〈口〉习语；词义溯源：在某物的［篱笆、围墙（fence）］之上；引申自“坐在围墙上左右观望”一意
例 Republicans accuse the President of being on the fence with regards to the issue of income tax cuts. 共和党人指责总统在降低所得税方面采取中立态度。
47. on the fritz / on the blink ** 出故障，出问题
解 习语；词义溯源：处于［不能用、不能运行（fritz）］的状态
例 Our fax machine is on the fritz. You'll have to use the one in the business center. 我们的传真机出故障了。你只能用商务中心的了。
48. on the go ** 忙个不停
解 〈口〉习语；词义溯源：在［运动（the go）］中
例 I'm going to be on the go all day. If anyone calls while I'm out, take a message. 我一天都得忙个不停。如果我不在的时候有人来电话，让他留个言。
49. on the horizon ** 就要发生的，即将来临的
解 习语；词义溯源：在［地平线（horizon）］上；参照in the offing
例 A merger between the two aircraft manufacturers is rumored to be on the horizon.有传言说这两家飞机制造商即将合并。
50. on 〔in〕 the hot seat ** 处于尴尬的位置；坐立不安
解 习语；词义溯源：在［热椅子（hot seat）］上
例 Yesterday the Senate committee heard testimony from Reynolds' executives and today Morris will be on the hot seat. 昨天参议院委员会听取了雷诺兹的主管的证词，今天莫里斯的日子会不好过。
51. on the hour ** 准时；整点
解 习语；词义溯源：在［那个小时（the hour）］
例 Every radio station broadcasts a distinctive tone on the hour to mark the time. 每个广播站都以独特的音调整点报时。
52. on the job ** 工作中；在忙碌
解 习语；词义溯源：正在［工作（job）］
例 Mr. Kim doesn't trust us, so he checks on us often to make sure we're on the job. 金先生不信任我们，所以经常来查岗，以确保我们正在工作。
You shouldn't be making personal phone calls on the job. 上班时间你不应该打私人电话。
53. on the level ** 诚实的，可靠的
解 〈口〉习语；词义溯源：在［（同一）水平（level）］上；常与strictly连用，参照on the up-and-up
例 If I ever find out you're not being on the level with me, I'll fire you without hesitation. 如果我发现你没有跟我说实话，我会毫不犹豫地解雇你。
54. on the lookout for sb. or sth. / on the lookout ** 注意；警惕
解 习语；词义溯源：对某人或某事处于［警戒、监视（lookout）］的状态
例 During the Christmas season, shoplifting increases sharply. So tell the security guards to be on the lookout for shoplifters. 圣诞节期间，商店偷窃现象急剧增加。所以要让保安注意偷窃商店货物的人。
55. on the loose ** 自由，无约束；放荡；逍遥法外
解 〈口〉习语；词义溯源：处于［放松、松散（loose）］的状态
例 Two prisoners have escaped and are on the loose. 有两名囚犯越狱了，目前仍逍遥法外。
56. on the make ** 在增加的；急于求成
解 〈口〉习语；词义溯源：在［制造（make）］中
例 The biotechnology industry is on the make and will develop rapidly for years to come. 生物技术行业正处在上升期，未来几年将会快速发展。
57. on the market ** 上市的，出售的
解 习语；词义溯源：在［市场（market）］上
例 Several of the former tycoon's homes are on the market. 几位昔日巨头的房产目前正在出售。
58. on the mend ** 正在好转
解 习语；词义溯源：在［改进、好转（mend）］中
例 Economic figures released by the government today indicate the economy is on the mend after three years of recession.政府今天公布的经济数据显示，经过三年衰退之后，经济正在逐渐好转。
59. on the money ** 恰到好处；准确
解 习语；词义溯源：在［钱（money）］上
例 The weather forecast was on the money yesterday. It predicted sun in the morning and rain in the afternoon, and that's exactly what happened. 昨天的天气预报非常准确。预报说上午是晴天，下午会下雨，结果真是如此。
60. on the one hand / on one hand ** 一方面
解 习语；词义溯源：在［一只手（the one hand）］上
例 On the one hand, the bus terminal is a historic structure that ought to be protected. On the other hand, it is decrepit and would be expensive to renovate. 一方面，汽车站是一座历史建筑，应该得到保护。另一方面，它太破旧了，进行翻新的成本太高。
61. on 〔at〕 the point of doing sth. ** 正要…的时候
解 习语；词义溯源：在想要做某事的［那一刻（the point）］；参照 on the verge of doing sth.
例 On the point of collapsing, the illegitimate government resorted to military force to protect its grip on power.倒台之际，非法政府依靠军事力量来保护他们的权力。
62. on the Q.T. 〔QT〕 ** 秘密地
解 〈口〉习语；词义溯源：在［安静（QT）］的状态；QT是quiet的缩略形式
例 The whole matter was conducted on the QT. Nobody but the president and his closest aides had knowledge of it. 整件事都是秘密进行的。除了总裁和他最亲密的助手外，没有人知道。
63. on the spot ** 在现场；立刻，马上
解 习语；词义溯源：在［那一地点（the spot）］
例 I had to make a decision on the spot. There was no time for pondering. 我必须马上作决定。没有时间仔细考虑。
64. on the take * 受贿
解 俚语；词义溯源：在［获得、接受（take）］后
例 In her testimony, Ms. Jackson identified three Chicago police officers who were on the take from the drug dealers. 杰克逊女士在她的证词中确认有三名芝加哥警察接受了毒贩的贿赂。
65. on the trail of sb. or sth. ** 跟踪追击；寻找
解 习语；词义溯源：基于某人或某物的［脚印，痕迹（trail）］；参照track sb. or sth. down
例 Newton Industries is on the trail of an overseas location somewhere in South-East Asia. 牛顿实业正在寻求东南亚海外市场。
66. on the up-and-up / strictly on the up-and-up ** 可靠的，诚实的
解 习语；词义溯源：处于［诚实（up-and-up）］的状态
例 How do we know Thompson is being on the up-and-up? He could be lying. 我们怎么知道汤普森是否可靠？他可能在撒谎。
67. on the verge of doing sth. / on the verge ** 濒临，接近
解 习语；词义溯源：在［临界点（verge）］上；参照on the point of doing sth.
例 Rumor has it that Foster Shops is on the verge of bankruptcy. 有传言称福斯特商店目前濒临破产。
68. on the warpath ** 盛怒，大发脾气
解 〈口〉习语；词义溯源：在［敌对情绪（warpath）］上
例 About every two or three months, the boss has to go on the warpath about workers not wearing the company uniform. 大约每两到三个月，老板都得对不穿公司制服的员工发一次脾气。
69. on watch for sb. or sth. / on watch ** 值班；监视；警惕
解 习语；词义溯源：处于［监视（watch）］的状态
例 The primary function of the U.N. troops is to be on watch for any violations of the cease-fire agreement.联合国军队的主要功能是警惕任何破坏停火协议的行为。
70. on the 〔one's〕 way to doing sth. ** 在…的过程中，正要成为
解 习语；词义溯源：在做某事的［路（way）］上
例 I'm afraid we're on the way to damaging the environment to an irreparable degree. 恐怕我们现在破坏环境的程度已经到了无法挽回的地步。
71. on the wing ** 在飞行中；在奔波中
解 习语；词义溯源：在［飞行（wing）］中；正式用语，大多不用于人或者飞机而用于形容鸟类或者家禽
例 On the wing, the falcon is one of the few birds that can reach a speed up to 70 miles per hour. 在飞行时，猎鹰是少数几种速度能够达到每小时70英里的鸟类之一。
72. on the wrong track ** 想法错误；做法不对头
解 习语；词义溯源：在［错误的路（wrong track）］上
例 Suddenly we realized we had been on the wrong track all along. It wasn't biological problem, but one of molecular chemistry. 我们突然意识到，我们的想法一直都是错误的。这不是一个生物学问题，而是分子化学问题。
73. on thin ice ** 如履薄冰
解 习语；词义溯源：在［薄冰（thin ice）］上
例 Having lost 43 of their 64 seats in the legislature, the once mighty party now finds itself on thin ice. 这个原来极为强势的党派在议会64个席位中失去了43个，现在他们如履薄冰。
74. on time ** 按时，准时
解 习语；词义溯源：在［正好的时间（time）］上
例 The meeting starts at 2:15 and I expect everyone to be on time. No exceptions!会议在2:15开始，我希望所有人能准时参加。所有人！
75. on tiptoe ** 踮起脚尖；悄悄地
解 习语；词义溯源：用［脚尖（tiptoe）］
例 Early the next morning, he left a note on her kitchen table and left the apartment on tiptoe. 第二天一早，他在她的餐桌上留了一张纸条，然后悄悄离开了公寓。
76. on top ** 在上方；领先
解 习语；词义溯源：在［顶部（top）］
例 Dover High School is on top, with fourteen games won and only one lost. 多佛高中处于领先地位，他们赢了14场比赛，只输了1场。
77. on top of sth. ** 在…之上
解 习语；词义溯源：在某物的［顶端（top）］
例 On top of the hill was a solitary two-story house, silhouetted against the blue sky. 山顶上有一栋独立的两层楼房，蓝蓝的天空映衬出它的轮廓。
78. on top of the world / sitting on top of the world ** 在世界之巅；欣喜若狂
解 习语；词义溯源：在［世界的顶端（top of the world）］
例 Following the championship, the whole team was on top of the world. 获得冠军之后，全队成员都欣喜若狂。
79. on trial ** 在试验中；在试用中；在受审
解 习语；词义溯源：在［试验，审判（trial）］中
例 The group is on trial for the kidnapping and murder of Minister Fang.小组正在调查绑架谋杀方部长的案件。
Robot cooks are on trial now at several McDonald's locations.一些麦当劳店正在试用机器人厨师。
80. on vacation ** 度假中，休假中
解 习语；词义溯源：处于［休假（vacation）］的状态
例 Sorry, but Mr. Li is on vacation. Can someone else help you? 抱歉，李先生正在度假。可以找别人帮你吗？
