from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Secret or surreptitious; clandestine: a backdoor romance.
- adj. Sports Of or directed toward a player who has slipped behind the opposing defense: a backdoor pass.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Alternative spelling of back door.
- v. Alternative spelling of back door.
from the GNU version of the Collaborative International Dictionary of English
- adj. Acting from behind and in concealment; backstairs.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an undocumented way to get access to a computer system or the data it contains
- n. a secret or underhand means of access (to a place or a position)
- n. an entrance at the rear of a building
From the phrase back door. (Wiktionary)