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Discover LudwigThe phrase "a back door" is correct and usable in written English.
It can be used in contexts related to security, technology, or metaphorically to describe an alternative or hidden method of access.
Example: "The software had a back door that allowed unauthorized users to gain access to sensitive information."
Alternatives: "an alternative access point" or "a hidden entryway".
Idiom
By the back door.
If something is started or introduced by the back door, then it is not done openly or by following the proper procedures.
Exact(52)
Quickly, Assange discovered a back door.
A back door in the library.
"Is there a back door?" "Yes, yes.
Maybe there was a back door, I don't know.
There can be real cachet in using a back door.
The barman opened a back door and let him out.
Similar(7)
Is she working a back-door deal with Cary?
I'm a back-door man I'm a back-door man What the mens don't know The little girls understand.
They are not a back-door route to forcing changes to America's own labour laws.
Critics of sensible immigration policy are accusing the administration of a "back-door amnesty".
He throws a back-door cutter to right-handers and has also incorporated a sinker more.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com