The straw that broke the camel’s back
The last of many small unpleasant things that makes a situation too much to handle or too upsetting.
A heart of gold
This refers to a person who is kind, good-natured, or generous. The term "gold" is used because it's something valued for its goodness.
As cool as a cucumber
The person is relaxed
The moon played hide and seek with the clouds.
The moon is covered by clouds
My grandmother is as old as the hills
The grandmother is very old
Driving me up the wall.
Making someone infuriated and annoyed.
All the world's a stage
It means that the world is like a stage where everyone is just acting to get through each day. It's cynical, but we can't deny the truth behind it.
As sweet as sugar
The person is very kind
My flowers were begging for water.
The flowers were very dry and needed to be watered
She is as heavy as an elephant
She is very large
Once in a blue moon.
It happens very rarely.
A diamond in the rough
Saying that someone is a diamond in the rough is like saying that they are a good person who lacks manners, education, or style.
Last night, I slept like a log.
I slept very well
Time flies when you're having fun.
Time goes by more quickly when you are enjoying yourself
He saw his childhood friend after ages.
He saw his childhood friend after being apart for awhile
Go the extra mile.
To do more than is expected of you.
A special snowflake
If someone is described as a special snowflake, it means that person claims to have unique traits that entitle them to special treatment.
Watching the show was like watching grass grow.
Watching the show was very boring
At precisely 06:30 my alarm clock sprang to life.
My alarm went off at 6:30 AM
The suitcase weighed a ton.
The suitcase was very heavy
When pigs fly.
There is no chance of it happening.
Feeling blue
To feel blue is to feel sad.
Your explanation is as clear as mud.
I do not understand your explanation
New York is the city that never sleeps.
New York is a very busy city, even at night when most people are asleep
Spring break will never come.
Spring break feels like it is very far away