Food Idioms
Colour Idioms
Animal Idioms
Weather Idioms
Money Idioms
100

That test was a piece of cake! I knew all the answers. 

A task or activity that is easy to complete

100

All I have to do is get the green light from my mom before I can go. 

To get permission to do something

100

Sally's such a bookworm. She's always in the library, reading. 

Someone who reads a lot

100

Oh wow, this thunderstorm is crazy! It's raining cats and dogs out here.

Raining very heavily

100

Look like a million bucks

To look and feel fantastic

200

My brother is a couch potato. He just sits around all day watching movies. 

A lazy person who watches too much television

200

My dad only cooks once in a blue moon, but when he does, it's delicious!

Very rarely

200

The students were quiet as a mouse during their final exam.

Very quiet

200

Wow, you finished your food lightning fast!

Extremely fast

200
Bring home the bacon
To earn money, to achieve success
300

She met someone else and now she left me. That's the way the cookie crumbles, I guess. 

That is just how it is

300

I passed that test with flying colors! Guess studying really does pay off. 

To pass something with a high score

300

Oh man, I'm so hungry I could eat a horse

Eat a lot, in large quantities

300

Im feeling under the weather today. I think I need to go home. 

To feel mildly ill or sick

300
Money does not grow on trees
It is not easy to get money, implies that the person you are addressing spends money too easily
400

I can't talk right now -- I have bigger fish to fry.

Have more important things to do

400

Susie’s never happy. Every time she gets what she wants, she forgets it and starts looking for something new. She always thinks the grass is greener on the other side.

People think that they will be happier if things were different

400

If we go to the Chess club meeting, we can pass the mall on the way back home! We can kill two birds with one stone.

To solve two problems with one action

400

It was like I was on cloud nine when I visited Disneyland for the first time. 

Very happy

400
Rome wasn't built in a day
It takes a long time to do something worth doing
500

The girls were like two peas in a pod; you could hardly tell them apart!

Nearly identical, very similar

500

Opening at this show is a golden opportunity! After this concert, people will actually know who I am. 

A very good chance to achieve something

500

John let the cat out of the bag when he accidentally let Manny know about his surprise birthday party. 

A secret that was supposed to be kept quiet that was told

500

Head in the clouds

Have unrealistic or impractical ideas

500
Put your money where your mouth is
To do something rather than just to talk about it