Show:
Food Idioms
Colour Idioms
Animal Idioms
Weather 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

hold your horses!

wait your turn!

100
Raining cats and dogs
Raining very heavily
100
Look like a million bucks
To look and feel fantastic
200
A couch potato
A lazy person who watches too much television
200

Beet red

Face turned very red (usually embarrassed)

200
As quiet as a mouse
Very quiet
200

come rain or shine

whatever the weather may be, that person will be there

200
Cheapskate

Someone who does not like to spend money

300

A smart cookie

A smart person

300

in the dark

unaware of something

300
Eat like a horse
Eat a lot, in large quantities
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

Not my cup of tea

Not the type of thing I usually enjoy

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
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

true colors 

real self

500
Let the cat out of the bag
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