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