Note: The adjective is also spelled 'next-door'.
1.
If a room or building is next door , it is the next one to the right or left.
I went next door to the bathroom...
She was next door at the time.
...the old lady who lived next door...
The flat next door was empty.
ADV : ADV after v , be ADV , n ADV
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Next door is also an adjective.
She wandered back into the next door room...
The wires trailed through other parts of the HQ into a next door building.
ADJ : ADJ n
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If a room or building is next door to another one, it is the next one to the left or right.
The kitchen is right next door to the dining room.
PREP-PHRASE
2.
The people next door are the people who live in the house or flat to the right or left of yours.
The neighbors thought the family next door had moved.
ADV : n ADV
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Next door is also an adjective.
Our next door neighbour knocked on the door to say that our car had been stolen.
ADJ : ADJ n
3.
If you refer to someone as the boy next door or the girl next door , you mean that they are pleasant and respectable but rather dull.
She was the girl-next-door type.
PHRASE