hit the sack
go to bed
break a leg
you say that for good luck
call it a day
to decide that you have finished doing something
under the weather
if someone is under the weather they feel ill
spill the beans
to tell people secret information
see eye to eye
if two people see eye to eye they agree with each other
the last straw
problems that makes impossible to accept
cost an arm and the leg
to very expensive
when pigs fly
something that will never happen
