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The door next to yours or next to the one being talked about. It could be adjacent, it could be above or below, across the street... so long as there are not other doors in-between.

Usually refers to the building that the door belongs to, often which is a home.
Nick lives next door to David on Downing Street. David's place is number 10 and Nick's is number 11.

Out in the countryside, Mr Eavis's farm has a border along a long road. Mr Park's farm is on the other side of the road. Their farms are next door to each other.
by natts November 12, 2013
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Oct 29 Word of the Day
When you meet with someone without anyone knowing except you and the person.
by Timbs March 08, 2017
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