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