to be extremely expensive
cost and arm and a leg
To say that it's time to go to bed
hit the sack
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
You use it for wishing someone good luck
Break a leg
agree with each other
see eye to eye
slightly unwell or in low spirits.
Under the weather
Reveal something prematurely
Spill the beans
you decide to stop what you are doing because you are tired of it
Call it a day
a way of saying that something will never happen.
When pigs fly