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1. Piece of cake
Meaning: something is very easy to complete.

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2. Costs an arm and a leg
Meaning: very expensive.

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3. Break a leg
Meaning: Break a leg actually means good luck!

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4. Hit the books
Meaning: To study, especially with particular intensity.

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5. Let the cat out of the bag
Meaning: disclose a secret that was supposed to be kept, well, as a secret.

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6. Hit the nail on the head
Meaning: find exactly the right answer.

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8. You can’t judge a book by its cover
Meaning : you should not decide upon something based just on outward appearances.

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9. Bite off more than you can chew
Meaning: to attempt to take on a task that is too much for you to handle.

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7. When pigs fly
Meaning: something will never happen, like fat little pink mammals soaring toward the sun!

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10. Scratch someone’s back
Meaning: to help someone out with the assumption that they will return the favor in the future!