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Food Idioms
Color Idioms
Parts of Speech
Weather Idioms
Random Idioms
100
A piece of cake
A task or activity that is easy to complete
100
Get the green light
To get permission to do something
100

Bookworm

Someone who reads a lot; noun

100
Raining cats and dogs
Raining very heavily
100

Another Trip Around the Sun for Kya! 

365 days = it's her bday! Dance party! 

200
A couch potato
A lazy person who watches too much television
200
Once in a blue moon
Very rarely
200

As quiet as a mouse

Very quiet; adjective

200
Lightning fast
Extremely fast
200
Bring home the bacon
To earn money, to achieve success
300
That is the way the cookie crumbles
That is just how it is
300
To pass with flying colours
To pass something with a high score
300

Eat like a horse

Eat a lot, in large quantities; verb

300
Feeling under the weather
To feel mildly ill or sick
300

create a dialogue using "hit the nail on the head" 

... uses it correctly

400
Have bigger fish to fry
Have more important things to do
400
The grass is greener on the other side
People think that they will be happier if things were different
400

Kill two birds with one stone

To solve two problems with one action; preposition

400
On cloud nine
Very happy
400
Rome wasn't built in a day
It takes a long time to do something worth doing
500
Two peas in a pod
Nearly identical, very similar
500
A golden opportunity
A very good chance to achieve something
500

Let the cat out of the bag

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

500
Head in the clouds
Have unrealistic or impractical ideas
500

What is the idiomatic expression for doing something very difficult? 

uphill battle... others