Kick the bucket.
To die.
Kill two birds with one stone.
The take care of two problems at the same time.
Bob's your uncle.
It's done. Often used after a set of simple instructions.
You live and you learn.
To make a mistake.
Read between the lines.
To find the hidden meaning in a statement.
Hang in there.
Don't give up.
Out of sight, out of mind.
You'll forget people or things that are no longer visible or present.
Beating around the bush.
To avoid or delay saying something uncomfortable.
It's raining cats and dogs.
It is raining very heavily.
Costs an arm and a leg.
An extremely high price for something.
Speak of the devil.
The person you were talking about suddenly shows up.
Cutting corners.
To do something quickly and poorly to save time or money.
We'll cross that bridge when we come to it.
Don't worry about that problem until it happens.
Jumping through hoops.
When you have to do a lot of complicated or annoying things to get something you want.
Catch 22
A problem with no solution; a situation that can't be resolved.
Miss the boat.
To lose an opportunity because you acted too slowly.
Don't put all your eggs in one basket.
Don't risk everything on one bet or decision.
Squash the beef.
To end a conflict by apologizing (or fighting).
Bite the bullet.
To do something that is unpleasant because you know need to do it eventually.
The bee's knees.
The best.
Let the cat out of the bag.
To give away a secret.
Bootlicker
Someone who always praises, defends, and supports people with authority or power.
A blessing in disguise.
A good thing that seemed bad a first.
Break a leg.
Good luck.