The must-know English Idioms

Extremely easy and straightforward.
EX: " That exam was a piece of cake"

To reveal a secret, often by mistake.
Ex: Jane let the cat out of the bag. Now Sally knows we are throwing her a surprise birthday party.

Ex: We're planning a surprise party for Sally. Don't let the cat out of the bag!

You shouldn’t make judgments based on appearance.
Ex: I know he looks big and scary, but my dog is really gentle and friendly. You can’t judge a book by its cover.

It means 'Good luck! ' and is said before performing onstage.
EX: I hope the performance goes well, Brittney. Break a leg!

Not feeling well, to be slightly sick or ill.
Ex: I'm not coming to the office today, i'm feeling a little under the weather.

Achieving a desired result at the very last second.
Ex: Amanda caught the train by the skin of her teeth. It left a few seconds later.

To feel extremely hungry.
Ex: I’m so glad I ordered an extra large pizza. I'm so hungry I could eat a horse!

Avoiding a subject by talking about irrelevant things.
Ex: I wish my boss would stop beating around the bush and tell me what he really thinks of my product idea.

Something that happens very rarely.
Ex: My dad only cooks once in a blue moon.

To be excited and nervous at the same time.
Ex: Francesca had butterflies in her stomach as she waited for her date outside the restaurant.

To be determined and physically or emotionally strong.
Ex: Barbara is a tough cookie. She doesn’t mind when people criticize her work.

To agree fully or have a similar attitude.
Ex: I’m glad my boss and I see eye to eye about recycling in the office.

It costs a large amount of money.
Ex: My new suit cost an arm and a leg. I bought it in Milan.

To steal an idea, or to divert attention away from someone.
Ex: Mallory stole my thunder when she told the professor the result of my experiment before I had the chance to do it myself.

To be alert and efficient.
Ex: keep your eye on the ball! We need everyone at their best to complete this project.

Ex: He is really on the ball and never makes a mistake at work.