鉄扉

1. Origins, structure, and basic meaning

• Structure: 鉄扉, read てっぴ, denotes a solid door constructed from iron.
• Basic usage: It names a heavy iron warehouse door and an old metal door bearing many scratches.

2. Common pitfalls and similar expressions

• A door made of iron
  • Its defining feature is iron construction and solidity; the door’s use depends on the building.