Definition of back door in English:

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back door

Pronunciation: /ˈˌbak ˈdô(ə)r/


1The door or entrance at the back of a building.
Example sentences
  • They pushed open the back doors and entered the building, passing by the control room and up the concrete back stairs, heading for their changing rooms.
  • Bob pried open one of the back doors to the building, and they all scrambled out into the cool night air.
  • Veon threw open his door and opened the back doors, grabbing his pistols and stuffing them into his belt.
1.1A feature or defect of a computer system that allows surreptitious unauthorized access to data.
Example sentences
  • Around the same time, Mydoom.A was infecting machines around the world, leaving a small backdoor to each infected computer.
  • Once downloaded, the victim unwittingly activates the backdoor by compiling Sendmail from source code.
  • It also attempts to open a backdoor on infected Windows PCs, allowing hackers to exploit compromised systems.


(also backdoor) [attributive]
(Of an activity) clandestine; underhanded: backdoor private deals
More example sentences
  • It seems to me it might be a back door attempt to get around the trial judge's findings of fact in this case.
  • It is a back door to privatisation and should be resisted by anyone who believes in the health service.

For editors and proofreaders

Syllabification: back door

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