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English definition of “next door”

next door

adverb uk   us  
very close: Would you want to live next door to a nuclear power station?

next door

noun [U] uk   UK informal us  
the person or people living in the next room, house, or building: Next door's having a party next week, did you know?

next door

adverb, adjective uk (also next-door)   us  
B1 in the next room, house, or building: A Russian couple have just moved in next door. Who lives next door to you? Margot is our next-door neighbour.
(Definition of next door from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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