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