Everything. All of it.
Whole nine yards.
To have no idea, do not know the answer to a question.
Your guess is as good as mine.
To further a loss with mockery or indignity; to worsen an unfavorable situation.
Add insult to injury.
Avoiding the main topic. Not speaking directly about the issue.
Beat around the bush.
Meaning: Feeling slightly ill.
Feel a bit under the weather.
Keep something away.
Keep something at bay
When someone finds it difficult to choose between two alternatives.
Caught between two stools.
When you are extremely desperate you need to take drastic actions.
Drastic times call for drastic measures.
Overwhelmed by what is happening in the moment.
In the heat of the moment.
The show has come to an end. It's all over.
Elvis has left the building.
Come to the point - leave out details.
Make a long story short.
Join a popular trend or activity.
Jump on the bandwagon
Someone who lacks intelligence.
Not playing with a full deck.
When someone understands the situation well.
On the ball.
Would never like to do something.
Wouldn't be caught dead.
Be optimistic, even difficult times will lead to better days.
Every cloud has a silver lining.
The final problem in a series of problems.
Last straw.
To take on a task that is way to big.
Bite off more than you can chew.
This means not to take what someone says too seriously.
Take with a grain of salt.
Be happy when a person leaves.
Be glad to see the back of.
Meaning: Happens very rarely.
Once in a blue moon.
Cannot judge something primarily on appearance.
Can't judge a book by its cover.
Being Inquisitive can lead you into an unpleasant situation.
Curiosity killed the cat.
A way of asking what someone is thinking.
A penny for your thoughts.
When something is done badly to save money.
Cut corners.
An assertion that, despite one's approach seeming random, there actually is structure to it.
Method to my madness.
When you complain about a loss from the past.
Cry over spilt milk.
Believe someone's statement, without proof.
Give the benefit of the doubt.
Meaning: without any hesitation; instantly.
At the drop of a hat.
To share information that was previously concealed.
Let the cat out of the bag.
Meaning: All the advantages.
Best of both worlds.
Looking in the wrong place. Accusing the wrong person.
Barking up the wrong tree.
To work late into the night, alluding to the time before electric lighting.
Burn the midnight oil.
This idiom is used to say that someone missed his or her chance.
Miss the boat.
This is used when someone does not want to choose or make a decision.
Sit on the fence.
A job, task or other activity that is easy or simple.
Piece of cake.
To present a counter argument.
Devil's Advocate.
Crazy, demented, out of one's mind, in a confused or befuddled state of mind, senile.
Off one's rocker.
Do or say something exactly right.
Hit the nail on the head.
To go to bed.
Hit the sack / sheets / hay
This idiom is used to say that two (or more people) agree on something.
See eye to eye.
People's intentions can be judged better by what they do than what they say.
Actions speak louder than words.
This idiom is used when something is very expensive.
Costs an arm and a leg.
Meaning - do not disturb a situation as it is - since it would result in trouble or complications.
Let sleeping dogs lie.
Something good that isn't recognized at first.
Blessing in disguise.
This expression is used when the person you have just been talking about arrives.
Speak of the devil!
Speak of an issue (mostly current) which many people are talking about and which is usually disputed
A hot potato
This idiom is used to express "Don't make plans for something that might not happen".
Don't count your chickens before the eggs have hatched.
This idiom means 'to hear rumors' about something or someone.
Hear it on the grapevine.
This means to deceive someone into thinking well of them.
Put wool over other people's eyes.
Do not put all your resources in one possibility.
Don't put all your eggs in one basket.
Means that something happens to you, or is done to you, that you have done to someone else.
Taste of your own medicine.
When an attempt fails and it's time to start all over.
Back to the drawing board.
To take the credit for something someone else did.
Steal someone's thunder.
Deal with a problem if and when it becomes necessary, not before.
Cross that bridge when you come to it.
A visual presentation is far more descriptive than words.
Picture paints a thousand words.
This idiom means, to accomplish two different things at the same time.
Kill two birds with one stone.
Actions or communications need more than one person.
It takes two to tango.
A good invention or innovation. A good idea or plan.
Best thing since sliced bread.
To succeed; to come up to expectations; adequate enough to compete or participate.
Cut the mustard [possibly derived from "cut the muster"]
Very different from.
Far cry from.
You are not very good at something. You could definitely not do it professionally.
Don't give up the day job.
It is up to you to make the next decision or step.
Ball is in your court.