“Piece of cake”

“Burn the midnight oil”

To work late into the night.

“Costs an arm and a leg”

Very expensive.

“Take it with a grain of salt”

To not completely believe something.

“Speak of the devil”

The person you were talking about appears.

“Break the ice”

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

“A picture is worth a thousand words”

An image can express more than words.

“Bite off more than you can chew”

To take on too much responsibility.

“Under the weather”

Feeling slightly ill or unwell.

“A dime a dozen”

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

“Wrap one's head around something”

To understand something complicated.

“Spill the beans”

To reveal secret information.

“Beggars can’t be choosers”

People with no options must accept what they get.

“Kill two birds with one stone”

To achieve two goals with one action.

“Cut corners”

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

“Back against the wall”

In a very difficult situation with no easy options.

“Time flies”

Time passes very quickly.

“A blessing in disguise”

Something that seems bad but turns out good.

“Break a leg”

A way to wish someone good luck.

“Let the cat out of the bag”

To reveal a secret accidentally or intentionally.

“Beat a dead horse”

To waste time on something already decided.