Easy
They're going bananas
They're acting crazy!
It cost an arm and a leg
It's expensive
She gave me the cold shoulder.
She ignored me.
Get off your high horse.
Stop acting conceited.
She's down in the dumps.
She's very sad.
It's raining cats and dogs
It's raining really hard
It's a piece of cake.
It's easy to do.
Stop pulling my leg.
Stop tricking me.
Cat's got her tongue.
She doesn't know what to say.
He's a big cheese.
He's a very important person.
He's catching some z's.
He's sleeping.
Don't let the cat out of the bag.
Don't tell the secret.
Stay on your toes.
Pay close attention.
He's all tied up
He's very busy.
We see eye to eye.
We agree
He's a barrel of laughs.
He's very funny.
Don't cry over spilled milk.
Don't cry over a problem that can be fixed.
I'm on top of the world!
I'm very happy!
She's been hitting the books.
She is studying hard.
She's afraid of her own shadow.
She's easily frightened.
I'm feeling under the weather.
I'm sick.
Put your thinking cap on.
Try to solve a problem.
Don't open a can of worms.
Don't start trouble.
That knocked my socks off.
That was really amazing.
I put my foot in my mouth.
I said something I shouldn't have said.