Be easy
Be a piece of cake
Good luck!
Break a leg!
Go to Sleep
Hit the sack
Say the truth, tell a secret...
Spill the tea / beans
Stop doing something
Call it a day
I'm a little bit ill
I'm a little bit under the weather
Something not probable to happen
When pigs fly
The last thing to happen before getting angry
The last straw
Agree with someone
See eye to eye
Be very expensive
Cost an arm and a leg