Longman Dictionary of Contemporary English homepage

back door

 noun
     
Related topics: House, Buildings
back door [countable]
1DHHTBB a door at the back or side of a building
2

get in through the back door

to achieve something by having an unfair secret advantage:
His father works there so he got in through the back door.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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