Be a piece of cake
Meaning:
To be very easy
If something is a piece of cake, it is very easy to do.


Be all ears
Meaning:
Be very intersted in what someone is about to say.

If you are all ears, you are eager and ready to listen to what someone is going to say.


Bring the house down
Meaning:
Make people (audience) excited, laugh, or enjoy a lot while performing or making a speech

If you, your performance, or your speech brings the house down, your performance or speech is so good that the audience enjoys it a lot, becomes excited, applauds (clap their hands), or laughs a lot.



Don't let the grass grow under your feet.
Meaning:
Act now without any delay.
If you say "Don't let the grass grow under your feet" to someone, you tell him/her not to waste time and to do something immediately.

If someone doesn't let the grass grow under his/her feet, he/she does something right now without waiting.



Be down in the dumps
Meaning:
Be very sad and depressed.
If you are down in the dumps, you feel very sad and miserable. You don't have much interest in life.


Feel like a fish out of water
Meaning:
Feel uncomfortable because you are in an unfamiliar situation.
If you feel like a fish out of water, you feel awkward or uncomfortable because you are in an unusual or unfamiliar situation.


Hit the ceiling / Hit the roof
Meaning:
Become extremely angry.
If you hit the ceiling / roof, you get very angry.


i hope you like these idioms
and i will bring more in a couple of days inshaalah

Here are more idioms with their meanings
hope you all like them

Hold One's Horses
Meaning:
Wait; Be patient and careful; Wait and listen to what someone's saying.
You say "Hold your horses" to someone when he/she is impatient
or wants to do something immediately without thinking about his/her action and consequences carefully.
You tell him/her to be patient and wait.


Be in the same boat
Meaning:
Be in the same situation or have the same problem as another person.
If you and I are in the same boat, we are in the same bad or unpleasant situation.


The last/final straw
Meaning:
The last in a series of unpleasant or undesirable events that makes you unable to accept a situation any longer. 

If an event that follows a series of bad events or experience makes you feel you cannot tolerate a situation
any more and finally decide to leave it or do something to change it,
you call the event the last or final straw.
People also call it the last/final straw that broke the camel's back.



Be like the cat that got the cream
Meaning:
(about a person) To be pleased with his/her ability or what he/she has done.

If you are like the cat that got the cream, you are very happy because you are happy about or satisfied with your own talent, accomplishment, or what has happened to you.
People also say, "You look like the cat that ate the canary."



Feel / Look like a million dollars
Meaning:
Feel very happy.
Look very attractive.
If you feel like a million dollars, you feel extremely good, often because you are doing something luxurious.



Not hold water
Meaning:
Not seem reasonable or correct.
If something such as an arguments or a statement does not hold water, it is not reasonable or true.

Once in a blue moon
Meaning:
Rarely, almost never
If you say something happens once in a blue moon, you mean it happens very rarely.

A blue moon is the second of two full moons in the same month, which happens rarely.

Out of the blue
Meaning:
Suddenly and unexpectedly

If someone does something or something happens out of the blue, it happens suddenly and surprises you because you didn't expect it.

Out of the frying pan and into the fire
Meaning:
This idiom is used to say that someone gets out of a difficult or bad situation, but eventually goes into a more difficult or worse one.

If you say "Out of the frying pan and into the fire", you mean someone has moved from a bad or difficult situation to a worse one.

Put yourself in someone's shoes
Meaning:
Try to understand someone's situation.
If you put yourself in someone's shoes, you try to understand what his/her situation is like and think about it as if you were in the same situation.
Rain cats and dogs
Meaning:
To rain very heavily.

If you say "It's raining cats and dogs," you mean it is raining very heavily.
See the light
Meaning:
Understand or believe something that you didn't before
If you see the light, you suddenly understand something that you didn't before, something that other people have been trying to persuade you to understand.
So far so good
Meaning:
Things have been going well until now.
If you say "So far so good," you mean everything has been happening successfully up to now.
This expression is used often when you there might have a problem soon.
Wear one's heart on one's sleeve
Meaning:
Show emotions or feelings openly.

If you wear your heart on your sleeve, you openly express your feelings or emotions to others.


i hope to read some responses ;i(6