“Beat a dead horse”

“Take it with a grain of salt”

To not completely believe something.

“Actions speak louder than words”

What people do is more important than what they say.

“Let the cat out of the bag”

To reveal a secret accidentally or intentionally.

“Break a leg”

A way to wish someone good luck.

“Costs an arm and a leg”

Very expensive.

“Kill two birds with one stone”

To achieve two goals with one action.

“Burn the midnight oil”

To work late into the night.

“Piece of cake”

Something very easy to do.

“Spill the beans”

To reveal secret information.

“Once in a blue moon”

Very rarely.

“Speak of the devil”

The person you were talking about appears.

“Ball is in your court”

It is your decision or responsibility now.

“Barking up the wrong tree”

To make a wrong assumption.

“Wrap one's head around something”

To understand something complicated.

“Bite off more than you can chew”

To take on too much responsibility.

“Get out of hand”

To become uncontrollable.

“When pigs fly”

Something that will never happen.

“A dime a dozen”

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

“Better safe than sorry”

It’s better to be cautious than regret later.

“Beat around the bush”

To avoid saying something directly.