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It's raining cats and dogs
It's raining a lot/ very hard
Costs an arm and a leg
Very expensive
On the ball
Doing a good job
A piece of cake
Something is very easy
Feeling under the weather
Once in a blue moon
Something that does not happen often
Break a leg
Good luck
Getting a taste of your own medicine
Being treated the way that you have been treating others
The elephant in the room
The issue or problem that someone is trying to avoid
Don't judge a book by it's cover
Not judging something by its initial appearance
Giving someone the cold shoulder
Ignore them
Cutting corners
Not performing a task correctly in order to save some time or money
Doing something at the drop of a hat
Doing something at the moment of being asked
Killing two birds with one stone
Accomplishing two different tasks in the same undertaking
Beat around the bush
To avoid sharing your true viewpoint or feelings to avoid hurting someone else