Dictionary.com
definitions

next-door

[adverb neks-dawr, -dohr, nekst-; adjective neks-dawr, -dohr, nekst-]
SEE MORE SYNONYMS FOR next-door ON THESAURUS.COM

adverb

Also next door. to, at, or in the next house on the street, especially if it is very close by, or the adjacent apartment, office, room, or the like: Go next-door and get your sister. Your sister is next-door. Her brother lives next-door.

adjective

being situated or living next-door: next-door neighbors.

Origin of next-door

First recorded in 1475–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for next door

neighboring, immediate, warm, adjoining, adjacent, nearby, bordering, contiguous, accessible, available, handy, burning, touching, ready, close, abutting, nigh, near, edging, skirting
British Dictionary definitions for next door

next door

adjective, adverb (next-door when prenominal)

at, in, or to the adjacent house, flat, building, etcwe live next door to the dentist; the next-door house
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for next door

next-door

adv.

also nextdoor, 1570s, from noun phrase next door "nearest house" (late 15c.), from next + door. Noun meaning "the people living next door" is from 1855.

Online Etymology Dictionary, © 2010 Douglas Harper