Alternative forms

• backdoor, back-door

Pronunciation

• Audio (General Australian):

  (file)

  Category:English terms with audio pronunciation#BACKDOOR

Noun

back door (plural back doors)Category:English lemmas#BACKDOORCategory:English nouns#BACKDOORCategory:English countable nouns#BACKDOORCategory:English multiword terms#BACKDOORCategory:English entries with incorrect language header#BACKDOORCategory:Pages with entries#BACK%20DOORCategory:Pages with 1 entry#BACK%20DOOR

1. A subsidiary entrance to a building or house at its rear, normally away from the street.
   • 2023 January 11, Stephen Roberts, “Bradshaw's Britain: castles and cathedrals”, in RAIL, number 974, page 57:

     "Charles II, who was crowned here a little while before, occupied an old house (which is still standing) in New Street [Worcester], from which he escaped by the back door, as the enemy rushed in at the front."

     Category:English terms with quotations#BACKDOOR

2. A means of access, often secret and unprotected, to something.
   • 2021 November 29, Alan Shearer, “Why Newcastle have to win their next two games to give them hope of staying in the Premier League - Alan Shearer analysis”, in BBC Sport‎:

     Scoring three goals at home should guarantee you three points, but when you go on the attack a little bit more, you leave the back door open. That's not always a good idea with this team.

     Category:English terms with quotations#BACKDOOR

3. (computer securityCategory:en:Computer security#BACKDOOR) A secret means of access to a program or system.
4. (automotiveCategory:en:Automotive#BACKDOOR) A rear side door of a car, or at the back of a van.
5. (slangCategory:English slang#BACKDOOR) The anus; (by extension) anal sex.

   Synonym: backgate

   backdoor actionCategory:English terms with collocations#BACKDOOR

   go up the back doorCategory:English terms with collocations#BACKDOOR

   • 1998 June 28, Michael Patrick King, “Valley of the Twenty-Something Guys”, in Sex and the City, season 1, episode 4, spoken by Samantha:

     Oh, don't be so judgmental. You could use a little back door.

     Category:English terms with quotations#BACKDOOR

6. (golfCategory:en:Golf#BACKDOOR, informalCategory:English informal terms#BACKDOOR) The rear side of the hole, furthest from the golfer.
   • 2010, Bob Glanville, Golf: The Game of Lessening Failures, page 14:

     Sometimes the ball will curve around and enter from the back-door.

     Category:English terms with quotations#BACKDOOR

     Category:Quotation templates to be cleaned

Adjective

	A user suggests that this English entry be moved, merged or split, giving the reason: “almost exclusively found in the form backdoor now”.
	Please see the discussion on Requests for moves, mergers and splits(+) for more information and remove this template after the request has been fulfilled.

back door (not comparable)Category:English lemmas#BACKDOORCategory:English adjectives#BACKDOORCategory:English uncomparable adjectives#BACKDOORCategory:English multiword terms#BACKDOORCategory:English entries with incorrect language header#BACKDOORCategory:Pages with entries#BACK%20DOORCategory:Pages with 1 entry#BACK%20DOOR

1. (USCategory:American English#BACKDOOR, baseballCategory:en:Baseball#BACKDOOR) The path of a pitch which starts outside and then slides over the plate.

   He has a nasty back door slider.Category:English terms with usage examples#BACKDOOR

2. Achieved through indirect means.
3. (pokerCategory:en:Poker#BACKDOOR, of a draw) Requiring consecutive cards on the turn and river to be achieved.

   The flop had the ace of spades, queen of spades, and two of diamonds, and I was holding the king of spades and the three of hearts. I bet big, hoping for a jack and a ten to make my back door straight-draw, or a spade to make my back door flush-draw. But when the turn card was the five of clubs, I had to fold.Category:English terms with usage examples#BACKDOOR

Verb

back door (third-person singular simple present back doors, present participle back dooring, simple past and past participle back doored)Category:English lemmas#BACKDOORCategory:English verbs#BACKDOORCategory:English multiword terms#BACKDOORCategory:English entries with incorrect language header#BACKDOORCategory:Pages with entries#BACK%20DOORCategory:Pages with 1 entry#BACK%20DOOR

1. To attempt to accomplish by indirect means, especially when direct means are proscribed.
2. (surfingCategory:en:Surfing#BACKDOOR) 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.
   • 1999, Mark Warren, Mark Warren's Atlas of Australian Surfing, traveller's, →ISBN, page 103:

     If you survive the heavy take-off at 'The Chair' (which is very close to the rocks) you will find you're in 'The Suck-up', which offers either a spectacular barrel or a bonecrunching wipeout, but you might find you have to back door it.

     Category:English terms with quotations#BACKDOOR

3. (computer securityCategory:en:Computer security#BACKDOOR) To add a backdoor (a secret means of access) to a program or system.
   • 2018 February 26, Abhinav Singh, Nipun Jaswal, Monika Agarwal, Daniel Teixeira, Metasploit Penetration Testing Cookbook: Evade antiviruses, bypass firewalls, and exploit complex environments with the most widely used penetration testing framework, 3rd Edition, Packt Publishing Ltd, →ISBN, page 213:

     Now that we have backdoored the notepad.exe binary, we will go back to the Meterpreter session and upload our backdoor: 3. Then, we need to start a listener so we. meterpreter > upload notepad-backdoored.exe [*] uploading […]

     Category:English terms with quotations#BACKDOOR

   • 2015 April 13, Elisabeth Oswald, Marc Fischlin, Advances in Cryptology – EUROCRYPT 2015: 34th Annual International Conference on the Theory and Applications of Cryptographic Techniques, Sofia, Bulgaria, April 26-30, 2015, Proceedings, Part I, Springer, →ISBN, page 103:

     As an example, the generation algorithm for backdoored Dual EC picks a fixed group element Q, a random exponent d, and outputs as public key the pair P = Qd and Q. The secret key is d. (We use multiplicative notation for simplicity.) […]

     Category:English terms with quotations#BACKDOOR

   • 2019 July 18, Gilberto Najera-Gutierrez, Juned Ahmed Ansari, Daniel Teixeira, Abhinav Singh, Improving your Penetration Testing Skills: Strengthen your defense against web attacks with Kali Linux and Metasploit, Packt Publishing Ltd, →ISBN, page 453:

     Back in the session, we will rename the httpd.exe file to httpd.exe.backup, upload the backdoored version, and rename it to httpd.exe: msf exploit(handler) > sessions -i 1 [*] Starting interaction with 1... meterpreter > cd […]

     Category:English terms with quotations#BACKDOOR

Further reading

• back door on Wikipedia.Wikipedia
• backdoor (computing) on Wikipedia.Wikipedia
• “back-door n.”, in Green’s Dictionary of Slang, Jonathon Green, 2016–present.