To feel sick
To feel under the weather
Very expensive
To cost an arm and a leg
Used to say that two things are completely different
To be apples and oranges
To be waiting eagerly to hear about something
To be all ears
To go crazy / get very angry
To go bananas
To try to do something that is too difficult for you
To bite off more than you can chew
Very rarely
Once in a blue moon
To have something more important to do
To have a bigger fish to fry
To go to sleep
To hit the sack
Very easy
A piece of cake
Good luck!
Break a leg!
Very happy or excited about something
To be over the moon