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Food Idioms
Colour Idioms
Animal Idioms
Everyday Idioms
Money 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
Eat like a horse
Eat a lot, in large quantities
100
Raining cats and dogs
Raining very heavily
100
Look like a million bucks
To look and feel fantastic
200

cry over spilled milk

to get upset about something you cannot change.

200

Once in a blue moon

Very rarely

200
Kill two birds with one stone
To solve two problems with one action
200

beat around the bush

to avoid saying what you mean

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

wouldn't hurt a fly

to be a peace loving, tenderhearted person.
300
Feeling under the weather
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

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
Let the cat out of the bag
A secret that was supposed to be kept quiet that was told
400

don't bite more than you can chew

don't try to do more than you can handle 

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

when pigs fly

a way of saying that something will never happen

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