A piece of cake
A task or activity that is easy to complete
Get the green light
To get permission to do something
Bookworm
Someone who reads a lot
Raining cats and dogs
Raining very heavily
Look like a million bucks
To look and feel fantastic
A couch potato
A lazy person who watches too much television
Once in a blue moon
Doesn't happen very often, Very rarely
As quiet as a mouse
Very quiet
Lightning fast
Extremely fast
Bring home the bacon
To make money
That's the way the cookie crumbles
That's just how it is
To pass with flying colors
To pass something with a high score
Eat like a horse
Eat a lot, eat very fast
Feeling under the weather
Feeling sick
Money does not grow on trees
Money is valuable, It isn't easy to get money
Have bigger fish to fry
Have more important things to deal with
The grass is greener on the other side
People think that they will be happier if things were different
Kill two birds with one stone
To solve two problems with one action
On cloud nine
Very happy
Rome wasn't built in a day
It takes a long time to do something worth doing
Two peas in a pod
Two people who are very similar to each other
A golden opportunity
A very good chance to achieve something
Let the cat out of the bag
A secret that was supposed to be kept quiet that was told
Head in the clouds
Have unrealistic ideas, not paying attention
Put your money where your mouth is
To do something rather than just to talk about it