1.
back door, rear entrance
A door or entrance at the back of a building, as opposed to the main entrance.
裏口から入ってください。
Please enter through the back door.
正面玄関が閉まっていたので裏口を使った。
The front entrance was closed, so I used the back door.
裏口から荷物を運び入れた。
I carried the luggage in through the back door.
2.
backdoor, illicit means
Figuratively, an unofficial or illegitimate way of achieving something, often implying bribery or unfair advantage.
裏口入学は問題になっている。
Backdoor admissions have become a problem.
Refers to gaining admission through bribery or connections
裏口で仕事を取るのはよくない。
Getting work through backdoor connections is not good.
彼は裏口から政治の世界に入ったと言われている。
It's said that he entered the world of politics through the back door.
USAGE: 裏口 has both literal and figurative meanings.
LITERAL:
- 裏口から入る (to enter from the back)
- 裏口を開ける (to open the back door)
FIGURATIVE (illicit means):
- 裏口入学 (backdoor admission - through bribery/connections)
- 裏口営業 (illicit business)
CONTRAST:
- 表口/正面玄関 - front entrance
- 勝手口 - kitchen entrance, service entrance