on the run .  active； moving活动

With three young children to take care of， she is kept on the run every minute of the day．她每分钟都在忙，因为她要照看三个孩子。

They have been on the run getting ready for the performance．他们一直在为准备演出而四处奔波。

We are so busy at the office that we generally have to eat our lunch on the run．我们在办公室非常忙，常常一面工作一面吃午饭。

 on the run . in flight； running away逃走

The reports say that the rebels are on the run．有报道说，叛乱者正在溃逃。

Four men broke out of gaol last night．Three were caught， but one is still on the run．昨晚有四个人越狱，其中三人被逮住，但一人还在逃亡之中。

He is on the run from the police．他正在逃避警察的追捕。

on the shelf . lay aside； not useful any more搁在一边；不再使用

Maurice was put on the shelf when he reached the age of sixty-one．莫里斯六十一岁时，他的公司便不再用他了。

Some women think that if they've not got their man by the age of twenty ; they're on the shelf．有些妇女认为如果到了二十岁还找不到对象，那么结婚就无希望了。

She never married； she has been left on the shelf．她从未结过婚，现在也嫁不出去了。

The question was put on the shelf．这个问题被束之高阁。

 on the side . in addition to a main thing，amount or quantity此外；额外

His job at the hospital did not pay much，so he found another on the side．他在医院工作的报酬不多，所以他另外找了一份兼职。

Besides fruit，he bought some candies on the side．除了水果，他还买了些糖。

 on the side of . supporting支援；辅助

He was on the side of the oppressed．他站在被压迫者一边。

on the sly . secretly偷偷地

The boy smoked on the sly． 这男孩偷偷地抽烟。

She received letters， on the sly，from young men．她暗地里收到一些男青年的来信。

on the spot .  just there正在那里；在场

The police were on the spot within a few minutes of hearing about the crime．警察在接到犯罪消息的几分钟内就赶到了现场。

on the spot . without waiting立刻；当即

The news of important events is often broadcast on the spot over television．重要事件的新闻总是通过电视立即广播。

Anyone breaking the rules will be asked to leave on the spot．任何人违反规则，立即勒令退场。

on the spot .  in trouble， difficulty or embarrassment在困难中；在危险中

The question put me on the spot； I couldn't make an excuse or lie． 这个问题搞得我很尴尬，我既无法推托，又无法撒谎。

Bob was on the spot because he was unable to pay the money he owed．鲍勃陷入了困境，因为他无力偿还欠下的钱。

on the spot . in danger of being murdered有被暗杀的危险

After he talked to the police， the gangsters put him on the spot．他报告警察后，歹徒们就决定置他于死地。

on the square . honest诚实的

You need have no doubt of Jack's honesty．He is completely on the square．你不必怀疑杰克是否诚实，他绝对忠实可靠。

You must act on the square when negotiating for contracts．在签订谈判合同时，你必须处事公道。

Can we trust them to act on the square? 我们能够相信他们处事公正吗?

on the spur of the moment . in a sudden impulse一时高兴或冲动

He had not planned to take the trip； he just went on the spur of the moment．他事先没有计划这趟旅行，只是一时高兴就走了。

I've accepted the offer of a job abroad． I decided on the spur of the moment to go．我已接受了国外的工作并决定马上就走。

He acts on the spur of the moment．他凭一时冲动行事。

on the spur of the moment .  on the spot当场；即席

He can invent any number of excuses on the spur of the moment．他能当场诌出许多托辞。

Though quite unprepared，he was nevertheless able to sing a folk song on the spur of the moment．尽管毫无准备，他还是能即席演唱一首民歌。

on the stage . in or into the work of being an actor or actress当演员；登台演戏

She has been on the stage for many years．她已经当了多年演员了。

He went on the stage shortly after he left high school．他中学一毕业就当了演员。

on the strength of . with faith or trust in . 依靠；凭借

On the strength of the Committee's report，we have decided to carry out the reforms proposed．根据委员会的报告，我们决定实行所建议的各项改革。

On the strength of Bill's promise to guide us，we decided to climb the mountain．由于比尔答应带我们，我们才决定登山。

on the string . under somebody 's influence or control唯命是从；在…支配下

She was pretty and popular，with two or three boys on the string all the time．她漂亮又活跃，始终有两三个男孩围着她转。

on the track of . trying to find寻找

The lawyer is on the track of new proof in the case．律师正在这桩案子中寻找新的证据。

on the trot . in a state of continuous activity 忙个不停

I could do with a rest for a while；I've been on the trot all the morning．我真想休息一会儿，整个上午我一直在忙个不停。

The job kept me on the trot most of the week．我大半个星期都在忙着这件工作。

on the trot . one after another接连地；一个接一个

They have won three races on the trot．他们在赛跑中接连赢了三次。

She didn't sleep well for four nights on the trot．她已连续四个晚上没睡好觉了。