Meaning of next door in English

Adverb

1. in, at, or to the building, house, or room next to yours

my neighbor next door ー my next-door neighbor

Noun

1. the people, building, house, or room next door

Meaning of next-door in English

Adjective

1. in, at, or to the building, house, or room next to yours; adjacent

my next-door neighbor ― my neighbor next door