DOOR

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• to enter a business at a low level with the opportunity for advancement or being more successful in the future. A first step in something.

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• If something happens behind closed doors it happens in secret, away from observers.

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• To live next door to someone means to live in the house or apartment next to someone 

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• to take someone to the door as they are leaving. For example, after the meeting the director showed the visitors to the door.

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• to make it clear to someone that they must leave a building/meeting/employment... John insulted the owner of the shop and he was shown the door.

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• to make something possible. A university degree will open the door to future employment.