back door; rear entrance
Refers to a physical back door or rear entrance of a building, often used for deliveries or private access.
The delivery person always comes in through the back door.
The rear entrance of this shop faces the alley.
noun which may take the genitive case particle 'no', noun
backdoor; illicit; unauthorized
Figurative use for something done secretly or improperly, often to bypass rules or official channels. Common in compounds like 裏口入学 (backdoor admission).
See also: 裏口入学 (うらぐちにゅうがく)
It's rumored that he got into a prestigious university through backdoor admission.
The illicit deal was exposed and the company suffered a huge loss.
The delivery person came in through the back door.
The culprit escaped through the back door.
At night I always use the back door.