Get out of hand
Get out of control
To get something exactly right
Hit the nail on the head
Break a leg
Do well
Sick
Under the weather
Better late than never
Better to arrive late than not at all.
Something very expensive
Costs an arm and a leg
Call it a day
To stop doing something/task
To joke with someone
Pulling their leg
Get your act together
Start behaving or acting better
The person we were just talking about showed up!
Speak of the devil
Hang in there
Don't give up.
When someone's patience finally runs out.
That was the last straw.
A blessing in disguise
Something that seemed bad at first but turned out to be very good.
Avoid saying what you mean, usually because it is uncomfortable
Beat around the bush
A dime a dozen
Something very common
Start over
Go back to the drawing board.
It's not rocket science
It's not difficult/complicated
Doing something poorly in order to save time or money
Cutting corners.
No pain, no gain
Work hard for what you want.
To ignore someone
Give them the cold shoulder.