cost an arm and a leg
very expensive
the ball is in your court
it's your decision
bite the bullet
do something difficult
raining cats and dogs
raining heavily
get cold feet
become nervous
Break a Leg
Good luck
Under the weather
Feel sick
in hot water
in trouble
spill the beans
reveal a secret
when pigs fly
impossible
on cloud nine
extremely happy
hit the books
study hard
a piece of cake
very easy
