First set of idioms to help bring up your English level to a more native base

Idioms Set 1

To leave a task for later because we cannot do it now

When a person is very happy and content 
"I am on cloud nine right now"

Chose to not listen or ignore a person or situation 
"The police are turning a deaf ear to the situation in the city"

When you are delaying a task or doing it slowly 
"Stop dragging your feet John and apply for the job!"

When you do something too early or before it is ready

When you are trying to find something and seems impossible. 
"Looking for his phone number in the phone book was like looking for a needle in a haystack"

When a person is in a bad mood
"Wow, somebody woke up on the wrong side of the bed this morning"

Study hard 
"I have a test next week so I need to hit the books"

Go to sleep
"I am feeling pretty tired so I am gonna hit the sack"

When something is really easy 
"That was as smooth as butter. I thought it would be difficult"

When in a difficult or bad situation 
Teacher : "You boys are on thin ice. Talk one more time and you will go to the principals office".

To give something up before it goes really bad 
"I think bitcoin will lose its value so I will sell and cut my losses"