back door

Fetched 2026-10-26 (cache).

Synonyms: backdoor, back-door, back down, back room, barn door, back doors, clack door, back foot, back four, blank door

Antonyms: backdoor, back-door, back down, back room, barn door, back doors, clack door, back foot, back four, blank door

Related words from Datamuse; suggestions, not definitions.

Noun

1. A [[subsidiary]] [[entrance]] to a [[building]] or [[house]] at its rear, normally away from the [[street]].
2. A means of [[access]], often secret and unprotected, to something.
3. {{lb|en|computer security}} A secret means of access to a [[program]] or [[system]].
4. {{lb|en|automotive}} A rear side door of a car, or at the back of a [[van]].
5. {{lb|en|slang}} The [[anus]] (usually in sexual practices).
6. {{lb|en|slang|by extension|uncountable}} {{U|anal sex}}.
7. {{lb|en|golf|informal}} The rear side of the hole, furthest from the golfer.

Adjective

1. {{lb|en|US|baseball}} The path of a [[pitch]] which starts outside and then slides over the [[plate]].
2. Achieved through indirect means.
3. {{lb|en|poker|of a [[draw]]}} Requiring consecutive cards on the [[turn]] and [[river]] to be achieved.

Verb

1. To attempt to accomplish by indirect means, especially when direct means are [[proscribed]].
2. {{lb|en|transitive|surfing}} To enter a [[tube]] by accelerating from behind; to surf into an already formed hollow wave, in contrast to the normal method of slowing to allow a [[surfable]] wave to form.
3. {{lb|en|transitive|computer security}} To add a backdoor (''a secret means of access'') to a program or system.
4. {{lb|en|transitive|slang}} To [[betray]] (someone); to [[double-cross]] (someone); to [[set up|set]] (someone) [[set up|up]]; to [[take advantage of]] (someone's) [[trust]].

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.