on the turn . about to turn or change正在转变中

The tide will soon be on the turn and then we can make a start．形势马上会变，然后我们就可以开始干了。

on the turn .（of milk）on the point of becoming sour（牛奶）正在变酸

The milk is on the turn；you'd better not drink it ．牛奶变味了，最好别喝它。

on the up-and-up . honest诚实的

You can take his word for it ．He has always been on the up-and-up．你可以相信他的话，他一向老实可靠。

This information is on the up-and-up．这消息完全可靠。

on the up-and-up . improving；succeeding走上坡路的；越来越好的

From now on，everything is on the up-and-up．从现在起，一切事情都会好转。

The guy's on the up-and-up and I know it ．这小伙子步步高升，这我是知道的。

on the verge of . near；close to快要；濒于

When I went into her room I found her on the verge of departure．当我走进她房间时，发现她正准备出发。

He was on the verge of bankruptcy．他濒临破产。

on the warpath . very angry非常生气

The police are on the warpath because the suspect is at large．警察当局极为恼火，因为嫌疑犯还逍遥法外。

on the warpath . fighting；making an attack攻击；作战

The government is now on the warpath against pollution．政府现在正着手解决污染问题。

on the watch . alert；watchful留心；警戒

The customs inspector was on the watch for diamond smugglers．海关检查人员留心是否有宝石走私犯。

on the way . while travelling or going在途中

The train left and Bill was on the way to New York．火车离开了，比尔踏上了去纽约的路途。

These machines are already on the way out．这些机器很快就要过时了。

on the whole . usually；in most cases通常

On the whole，children begin walking when they are about one year old．一般来说，小孩一岁左右开始走路。

On the whole，men are stronger than women．一般来说，男人比女人强壮。

on the whole . generally speaking；in the most important things大体上；总的说来

On the whole our stay there was quite enjoyable．总的说来，我们待在那里是很开心的。

On toe whole we're happy living here，but it is a long way away from my parents'home．总的说来，我们住在这儿很愉快，但就是离我父母家太远了。

on the wing . always very busy忙碌不停

Susan was on the wing doing things to get ready for her trip．苏珊忙个不停，为旅行作准备。

He was on the wing early．他很早就起来活动了。

on the wing . travelling；going somewhere在旅行中

We stayed in Britain for a week and then we were on the wing again．我们在英国逗留了一个星期，然后又上路了。

on time . punctually；promptly准时

They forecast the weather accurately and on time．他们预报天气既精确又准时。

If the train is on time，I should reach home before dark．如果火车不误点，我应该在天黑前到家。

The train left on time．火车准点发车。

 on tiptoe . on one's toes with the rest of the feet raised above the ground以趾尖（行走、站立）

He left the room on tiptoe so as not to disturb his roommates．为了不打扰同室的人，他轻手轻脚地离开了房间。

All the crowd stood on tiptoe to have one more look at her．所有的人都踮脚站着，希望能多看她一眼。

 on tiptoe . eager；excited渴望的；殷切期望的；激动的

With the Spring Festival coming，the children were on tiptoe．春节快到了，孩子们殷切地盼望着。

She was on tiptoe on the morning of her wedding．举行婚礼的那天早晨，她非常激动。

We were on tiptoe to learn the result of the election．我们迫切希望知道选举结果。

on top of . above在…之上

A submarine is a ship that can run under water as well as on top of water．潜水艇可行水下，亦可行水上。

Just put the dictionary on top of those books．把这本字典就放在那堆书上。

on top of . very close to .靠近

The elevator was so crowded that everybody was on top of each other．电梯非常拥挤，大家你挤我，我靠你。

When I turned the corner，I was right on top of the post office．我一转弯，邮局就在我眼前。

on top of . in control of管理；控制

Although his new job was very complicated，John was on top of it within a few weeks．尽管约翰的新工作非常复杂，但他几星期之内就掌握了。

He acted like a man on top of his job．他装得象对自己工作很内行一样。

on top of . in addition to；along with此外；还有

He promised to help us and on top of that he lent us many reference books．他答应帮助我们，并把许多参考书借给我们。

He came late，and on top of that he didn't bring the papers．他迟到了，而且也没有把文件带来。

on top of . knowing all about通晓；十分了解

He is always on top of the latest developments in his field of work．他总是通晓自己业务领域内的最新发展情况。

Joan stays on top of the news by reading newspapers and magazines．琼看报纸与杂志，所以了解各种新闻。

on top of the world . feeling pleased and happy；feeling successful非常高兴；觉得成功

The sea and the warm sun made them feel on top of the world．大海和温暖的阳光使他们感到无比的快乐。

Having won the first prize，he is on top of the world．他得了一等奖，欣喜若狂。