It's raining cats and dogs
it's all Greek to me.
something is difficult to understand.
Throw in the towel
to give up
You can't teach an old dog new tricks.
Very difficult for people to change their old habits, ways of thinking, or behavior, especially as they get older.
Rome was not built in a day
some things take a long time to do
Break a leg
Good Luck!
Don't spill the beans.
Don't tell my secret.
When pigs fly.
That is not going to happen.
We don't see eye to eye.
We don't agree.
That was the last straw.
That was the last bad thing to happen and now I'm not doing it anymore.
Lose your head
to lose control of your emotions.
What is "Lose your temper".
This idioms means to become very angry.
to see red
This idioms means to get really angry.
What is "Get a grip on yourself".
This idioms means, to get control over your emotions.
What is, "Keep a Straight Face".
This idioms means, to try not to smile or laugh.
That was a piece of cake.
That was easy.
He was on pins and needles waiting for his grades.
He is worried about his grades.
Feeling under the weather
Feeling sick, not well
You hit the nail on the head.
To describe something exactly right.
I have butterflies in my stomach.
I'm nervous.
Kick the bucket
to pass away
Sleep like a log.
That costs an arm and a leg.
I'm going to hit the sack.
On thin ice
In a risky or dangerous situation.
Take the rap
To be punished or blamed for something
On the fence
Undecided, to have not yet reached a decision
Between a rock and a hard place
To face (have) two equally bad options/ outcomes
A toss up
To choose between two equally good or equally bad options (choices)
A no brainer
An easy decision; a choice that does not require a lot of thought