裏口

1. Origins, structure, and basic meaning

• Structure: The written form is 裏口, read うらぐち. Elements for back and entrance combine to denote either a physical rear entrance or an improper backdoor route.
• Basic usage: 裏口から運び入れる is the physical entrance used for deliveries, while 裏口から入る is a figurative route that bypasses an official examination.

2. Common pitfalls and similar expressions

• A physical rear entrance
  • Packages are carried into the building through its rear entrance. Example: 荷物は建物の裏口から運び入れました。 — We carried the packages into the building through the rear entrance.
• An improper shortcut
  • A scheme to avoid the official examination is framed as entry by a backdoor route. Example: 正規の試験を避けて裏口から入ろうとする企てが発覚しました。 — A scheme to bypass the official examination through a backdoor route was exposed.