next door
adverb
Britannica Dictionary definition of NEXT DOOR
1
a
:
in the next house, apartment, room, etc.
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The people (who live) next door own a very large dog.
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We've lived next door to [=next to] each other for the past 30 years.
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He/She seemed like the boy/girl next door. [=like a wholesome young man/woman from a middle-class family]
b
:
next to your or someone else's house, apartment, room, etc.
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He bought the house next door.
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I'll be staying in the room next door.
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Go next door [=to the house/apartment next door] and ask for a cup of sugar, please.
2
:
in a place that is very close to something else