[摘要]
· e rotten to the core坏透了、烂透了

Keep away from that boy. He is rotten to the core.

· cut corners偷工减料、走捷径、图省事、节约

Student is a serious thing. You can’t expect to cut co...

· e rotten to the core坏透了、烂透了

Keep away from that boy. He is rotten to the core.

· cut corners偷工减料、走捷径、图省事、节约

Student is a serious thing. You can’t expect to cut corners.

cut corners并不是都是贬义的，还表示节约，节省
With only $100 left, he had to cut corners to make his journey back home.

· have a crush on someone迷恋某人

Some teenager girls got a crush on the film star

· be a far cry from...与……相差甚远（一般用来表示水平或程度等的差距）

Though Dick has tried hard, it is still a far cry from what his father expects of him.

· chew the cud好好琢磨琢磨

I don’t want to jump to conclusions, I have to chew the cud on it for a few days.

· be cut out for...天生适合于……（用于否定句中）

Thank you for your kindness, but I can’t accept it. You know, I’m not cut for a manager.

· be completely in the dark一无所知，仍蒙在鼓里
keep someone in the dark; be left (kept) in the dark

He is a dictator. Though I’m the production manager, I’m completely in the dark as what to do next.

· a blind date初次约会

James was too excited to have dinner. He was having a blind date with Sue in the evening.

· have seen better days今非昔比

Look at our dean, He has seen better days.

· be out of one’s depth力所不及

Liu was extremely happy to have been admitted to Oxford, but soon he found he was out of his depth in his major.

· give someone a dose of his own medicine以其人之道还制其人之身

On April Fool’s Day, my classmates made me an April Fool. Next year, I’ll give him a dose of his own medicine.

· a drop in the bucket沧海一粟

He has suffered a lot in his life. Losing his job this time was only a drop in the bucket.

· play dumb with someone装聋作哑

It’s no use playing dumb with teachers. They know very well their students.
· be down in dumps垂头丧气，深情沮丧

I burned midnight oil yesterday. So I feel down in the dumps today.

· make the dust fly干得很起劲

Many volunteers are helping in the Olympic Games. They are making the dust fly without getting pay.

· go easy on...酌情处理……；节约使用……；对……手下留情

I hope the teacher will go easy on me. Otherwise, I’ll have no chance to pass the exam.

当介词on的后面跟得是something的时候，此语用来是“节约使用”或“小心对待”
Go easy on salt. We have to save some for the next meal.

· egg someone on to do something怂恿，鼓动某人干某事

Haven’t you seen him through? He can help you nothing but egg you on to do illegal things.

· rub elbows with someone和某人没有很深的交情

I suppose Jack doesn’t know me well. We have only rubbed elbows with other for several times.

· be at the end of one’s tether山穷水尽

Mark feels worried because he can’t write any new books. He is afraid that he is at the end of his tether.

· be at one’s wits’ end不知如何是好

My boy is such a mischief-maker. I am at my wits’ end with him.

· be at loose ends心里没有着落

Many old people feel at loose ends after their retirement.

· make both ends meet收支平衡

The newly-wed couple found it hard to make both ends meet.

· be green with envy羡慕极了

Don’t be green with envy. He deserves the prize, since he has spent a whole month on that paper.

· be of the essence绝对不可少，关键的

As for study, diligence is of the essence.

· a poor apology for...蹩脚货，名不副实

That travel agency was first-class, but it offered a poor apology for its service