Idioms

• A piece of cake: A task that can be accomplished very easily.

This math problem is like a piece of cake.

• A taste of your own medicine: When you are mistreated the same way you mistreat others.

What is happening to you is a taste of your own medicine.

• Blue moon: A rare event or occurance. 

A tornado in Puebla is a blue moon.

• Break a leg: A superstitious way to say 'good luck' without saying 'good luck', but rather the opposite.

Break a leg on your performance.

• Cross your fingers: To hope that something happens the way you want it to.

Cross your fingers so you can get a good grade.

• Over the top: Very excessive.

The price of this dress is over the top.

• A chip on your shoulder: Means you think you know a lot.

Vanessa have a chip on her shoulder.

• Break the ice: Overcome initial shyness.

Someone had to say something to break the ice.

• Turn over a new leaf:  Changing your better for the better.

That's in the past, you should turn over a new leaf.

• Sick as a dog: Means you are very ill.

I'm sick as a dog.