古びる

1. Origins, structure, and basic meaning

• Structure: 古びる（ふるびる） means acquiring an old or worn appearance over time.
• Basic usage: Use it for the look of an old bag or a design that does not become dated as years pass.

2. Common pitfalls and similar expressions

• Being old versus looking aged
  • 古い broadly describes something as old.
  • 古びる focuses on the change of taking on an aged or worn appearance over time.