Simple Definition of next door
: in the next house, apartment, room, etc.
: next to your or someone else's house, apartment, room, etc.
: in a place that is very close to something else
Full Definition of next door
: in or to the next building, house, apartment, or room <lives next door>; broadly : in or at an adjacent place
: next to
Examples of next door
He bought the house next door.
I'll be staying in the room next door.
Canada is right next door to the U.S.
First Known Use of next door
NEXT DOOR Defined for Kids
Definition of next door
: in or to the nearest building, apartment, or room <She lives next door.>
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