Something very easy to do
Piece of cake
Something happening unexpectedly
Out of the blue
Something that will never happen
When pigs fly
Get something inevitable over with
Bite the bullet
To do more than expected
Go the extra mile
Very expensive
Cost an arm and a leg
I love gossip!
Spill the beans
To describe exactly what is causing a situation or problem
Hit the nail on the head
Feeling a little bit sick
Under the weather
To wish someone good luck (especially before a performance)
Break a leg
To worsen a situation or increase anger
Add fuel to the fire
To go to bed
Hit the sack
Ask someone what they're thinking
Penny for your thoughts
The person you are talking about suddenly arrives
Speak of the devil
To join others in doing something popular
Jump on the bandwagon
To accidentally reveal a secret
Let the cat out of the bag