To say that it's time to go to bed
hit the sack
You use it for wishing someone good luck
Break a leg
you decide to stop what you are doing because you are tired of it
Call it a day
Reveal something prematurely
Spill the beans
agree with each other
see eye to eye
When something is easily
a piece of cake
the last in a series of unpleasant events that finally makes you feel that you cannot continue.
The last straw
to be extremely expensive
cost and arm and a leg
a way of saying that something will never happen.
When pigs fly
slightly unwell or in low spirits.
Under the weather
