A piece of cake
A task or activity that is easy to complete
The odd or bad member of the group
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
Very rarely
As quiet as a mouse
Very quiet
Feeling under the weather
To feel mildly ill or sick
Bring home the bacon
To earn money, to achieve success
That is the way the cookie crumbles
That is just how it is
To pass with flying colours
To pass something with a high score
Elephant in the room
An obvious problem that no one wants to discuss
On cloud nine
Very happy
Make ends meet
To have just enough money to pay for basic living expenses without going into debt
Have bigger fish to fry
Have more important things to do
Rose coloured glasses
Unrealistic view
Kill two birds with one stone
To solve two problems with one action
Snowed under
Completely overwhelmed or overloaded with work
Tighten your belt
To spend less money and live more frugally during hard times
Butter someone up
To flatter someone to gain a favour or advantage
Catch red handed
Catch someone in the act of doing something wrong or illegal
Let the cat out of the bag
To reveal a secret
Every cloud has a silver lining
There is something good or positive in every bad situation
Money talks
The idea that having wealth gives a person power, influence, or the ability to get things done