輪ゴム

1. Origins, structure, and basic meaning

• Structure: 輪ゴム, read わごむ, is a looped rubber band.
• Basic usage: 輪ゴムで留める uses it as a fastening tool; 輪ゴムが切れる makes the worn band the thing that snaps.

2. Common pitfalls and similar expressions

• A looped rubber band for fastening
  • 輪ゴム is a loop-shaped rubber band stretched to bundle or secure objects. Excessive stretching or aging can weaken it and cause breakage.