Cost an arm and a leg极其昂贵

To be very expensive

Example:I love that fur coat. However, I don't think I'm going to buyit because it costs an arm and a leg.

A bad egg缺乏道德的人

Somebody who has no moral principles and should be avoided

Example:You mustn't lend Tim money, he's a bad egg. You'll never seehim or your money again!

Be in the air将要发生的事情

The feeling or idea that something new is about to happen or isgoing to change

Example:From the arguments going on at the meeting, it seems that achange in policy is in the air.

Clear the air消除误会

To settle a dispute and restore good relations

Example:We had a meeting with the workers, and I think we've clearedthe air now.

In the Bag稳操胜券

Said of an achievement which is secure

Example:We have the deal in the bag. The client came in this morningto sign the agreement.

In the balance未知的，不可预测的

Said when the outcome of a situation is unknown or unpredictable

Example:His career as a pilot is in the balance, as his eyesight doesnot seem good enough.

Drive a hard bargain极力讨价还价

To have the negotiating strength and skills to get the mostadvantageous price and conditions

Example:Amanda is negotiating the best price from the suppliers. Shedrives a hard bargain.

Ring a bell看上去或听起来非常熟悉

To look, sound or seem familiar

Example:That face rings a bell, where have I seen him before?

Tighten one's belt节衣缩食

To cut down on spending because there is less income than before

Example:Now you are out of work, you'll have to tighten your belt andgive up buying new clothes and going out so often.

Kill two birds with one stone一石二鸟

To complete two tasks together, with less effort than doing themseparately

Example:Since I'd gone to the store to buy some bread, I thought ofkilling two birds with one stone and invited Mr. Biggs to the party.

Be in a black mood情绪极差

To be so negative about everything that it is impossible foranyone to reason with him/her

Example:My father has been in a black mood for days, we dare not sayanything to him.

New blood新成员

New people brought into an organization to introduce different andoriginal ideas

Example: It was decided to bring new blood into the school by employingteachers with the latest training.

Feeling blue感到无精打采

Feeling sad or depressed

Example: She's feeling blue, because the man she loves is far away.

Get to the bottom of something弄清真相

To find out the truth about something

Example: I'm trying to get to the bottom of why David left without sayinggoodbye.

A piece of cake轻松的事

Something which is very easy to do

Example: Here…let me put the batteries in for you. It's a piece of cake.

Pay a call拜访

To visit somebody

Example: As we're in this neighborhood, we might as well pay the Jacksons acall, we haven't seen them for ages.

By chance偶然，意外的

Unexpectedly; with no prior planning

Example: By chance, I bumped into my wife in the shopping mall.

Round the clock夜以继日的

To do something continuously, without a break or pause

Example: The ambulance services worked round the clock hauling people trappedin the building to safety.

Keep one's cool保持冷静

To stay calm in a difficult situation

Example: If the traffic is jamed, the only thing to do is keep your cool, orget out of the car and walk!

In a tight corner处于困境

In an extremely difficult situation

Example: Whenever I get into a tight corner, I try to rely on quick thinking toget out of it.

Keep in the dark隐瞒

To keep something secret

Example: We know my brother has a new girlfriend, but he's keeping her name inthe dark.

Fall on deaf ears不加理睬的，不听取

Not to take any notice of what is said

Example: The city council's order that garbage should be put in the bins fellon deaf ears; the sidewalks are still littered with trash!

Take things easy放轻松

To relax

Example: It's better for our health to take things easy than to worry aboutproblems all the time.

Eat like a horse吃得很多

To eat a lot; to have a very big appetite

Example: Fred eats like a horse. When I was a growing lad like him, I used toeat a lot, too.

Catch one's eye吸引某人注意

To attract somebody's attention

Example: A movement behind the curtain caught my eye – I thought it was aburglar and rushed out of the room!

Have an eye for something对某事(某物体)了解得非常清楚

To be very good at doing something, or have a great understandingof something.

Example: As a botanist, he has to describe and draw plants accurately, so hemust have an eye for detail.

Turn a blind eye熟视无睹

To ignore an action, even though one should do something about it

Example: Parents will spoil their children if they constantly turn a blind eyeto their bad behavior.

Keep an eye on照看，密切注视

To watch carefully; to look after

Example: Keep an eye on my purse – I'm just going to the bathroom.

Lose face丢脸

To have one's reputation spoiled; to be embarrassed

Example: The large drug houses have lost face, because smaller companies areselling similar products at a cheaper price!