Idioms

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Who do you think you are?

The questioner is implying that the person to whom the question is addressed has exceeded their authority, interfered in something which was not their business.

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none of your business

Used to say that something is private information and should not be asked about.

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on the tip of my tongue

If something that you want to say is on the tip of your tongue, you think you know it and that you will be able to remember it very soon.

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off the top of my head

If you say something off the top of your head, you say it without thinking about it much before you speak, especially because you do not have enough time. This idiom suggests one has not used the inside of one's head before making some statement.
Off the top of my head I'd say we'll double our profits in a year.

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by the way

Used when you say something that does not relate to what is being discussed.
Oh, by the way, my name's Julie.

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Eat breakfast like a king, lunch like a prince, and dinner like a pauper.

Make the first meal of your day your biggest, and only eat three meals a day.

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Chicken and egg problem.

If you describe a situation as a chicken and egg situation, you mean that it is impossible to decide which of two things caused the other one.

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educational circles

You can use it to refer to people or organizations who are involved in education.

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white lie

A lie that is told in order to be polite or to stop someone from being upset by the truth

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which way the wind blows

If a person tries to discover which way the wind blows/is blowing, he/she tries to discover information about a situation, especially other people's opinions, before he/she takes action.
John knows which way the wind blows and always acts accordingly.

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take one's breath away

To make someone feel surprised and excited.
The beautiful new cinema took my breath away.

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a slip of the tongue

If you describe something you said as a slip of the tongue, you mean that you said it by mistake.

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to be born in purple

It was originally used to refer to babies born to the members of the royal family.

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lose one's temper

Lose self-control.

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bottom line

Main result/factor.
The bottom line is, I don't have enough money.

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castles in the air

Plans that have very little chance of happening.

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apple of one’s eye

Special favorite, beloved person or thing.
The youngest was the apple of his father's eye.

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bring home the bacon.

To bring home the bacon means to earn the household income.

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a drop in the bucket.

A very small amount compared to the amount needed

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at first sight.

Used to describe your first impression of someone or something, usually to indicate that this first impression was wrong or incomplete.
Love at first sight