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100

All ears

They are ready and eager to listen.

100

Butterflies in my stomach.

To be very nervous.

100

Cold shoulder.

To ignore someone.

100

Fish out of water.

 To feel awkward due to a specific, strange, or unfamiliar situation.

100

Have your head in the clouds.

To be unaware of what is going on.

200

As busy as a bee.

To be extremely busy.

200

Hold your horses.

Wait a moment.

200

In the same boat.

To be in a similar situation.
200

Raining cats and dogs.

It is raining very hard. 

200

Piece of cake.

Very easy.

300

To walk on eggshells.

To be very careful not to offend or upset someone.

300

To be the class clown.

A student who tries to make other students laugh or tries to be funny.

300

To cost an arm and a leg.

To be very expensive.

300

To be a couch potato.

A lazy and inactive person, who spends a great deal of time watching TV.

300

To kill two birds with one stone.

To achieve two things at one time.

400

To let the cat out of the bag.

To reveal a secret by being careless of by mistake.

400
To find a needle in a haystack.

To find something or someone that is very hard to find.

400

To let someone off the hook.

To allow (someone who has been caught doing something wrong or illegal) to go without being punished.

400

To be on cloud nine.

To be extremely happy and excited.

400

Two heads are better than one.

Used to say that it is easier for two people who help each other to solve a problem than it is for one person to solve a problem alone.

500

To zip your lips.

To be quiet,  do not talk.

500

At the drop of a hat.

To do something immediately.

500

Apple of my eye. 

A person that is very loved, or we are very proud of.

500

Cut to the chase.

To get to the point or to get to the important information quick.

500

Back to Basics.

To make things simple.