“Costs an arm and a leg”

“When pigs fly”

Something that will never happen.

“Bite the bullet”

To face a difficult or unpleasant situation bravely.

“Piece of cake”

Something very easy to do.

“Barking up the wrong tree”

To make a wrong assumption.

“The best of both worlds”

A situation where you enjoy two different advantages.

“Speak of the devil”

The person you were talking about appears.

“A dime a dozen”

Very common and easy to find; not special or valuable.

“Take it with a grain of salt”

To not completely believe something.

“Break the ice”

To do or say something that makes people feel more comfortable in a new or awkward situation.

“Under the weather”

Feeling slightly ill or unwell.

“Break a leg”

A way to wish someone good luck.

“Kill two birds with one stone”

To achieve two goals with one action.

“Spill the beans”

To reveal secret information.

“Bite off more than you can chew”

To take on too much responsibility.

“Wrap one's head around something”

To understand something complicated.

“Hit the nail on the head”

To describe exactly what is causing a situation or problem.

“Cut corners”

To do something cheaply or badly to save time or money.

“Once in a blue moon”

Very rarely.

“Better safe than sorry”

It’s better to be cautious than regret later.

“Get out of hand”

To become uncontrollable.