Meaning of “back door” in the English Dictionary

british dictionary

"back door" in British English

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[ C ] a door at the back or side of a building, or at the back of a vehicle:

There's someone at the back door.
He opened the back door and gestured for her to get into the car.

[ S ] used to refer to an indirect way of achieving something, especially so that people do not know about it and so cannot object to it:

HMI is to be privatised by the back door because the half of HMI who will not be employed by it will have to go and set up as private consultants.

(Definition of “back door” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)