As part of a sentence - Easy
A blessing in disguise
a good thing that seemed bad at first
Better late than never
Better to arrive late than not to come at all
A dime a dozen
Something common
That's the last straw
My patience has run out
Get something out of your system
Do the thing you've been wanting to do so you can move on
Beat around the bush
Avoid saying what you mean, usually because it is uncomfortable
Break a leg
Good luck
Make a long story short
Tell something briefly
Let someone off the hook
To not hold someone responsible for something
Break the ice
Make people feel more comfortable
Call it a day
Stop working on something
It's not rocket science
It's not complicated
Cut somebody some slack
Don't be so critical
Bite the bullet
To get something over with because it is inevitable
Birds of a feather flock together
People who are alike are often friends (usually used negatively)
Get out of hand
Get out of control
Pull yourself together
Calm down
Pull someone's leg
To joke with someone
Get your act together
Work better or leave
Costs an arm and a leg
Very expensive
No pain, no gain
You have to work for what you want
Speak of the devil
The person we were just talking about showed up!
Under the weather
Sick
Easy does it
Slow down
Give someone the cold shoulder
Ignore someone