枠

1. Origins, structure, and basic meaning

• Structure: 枠(わく) means an outer frame or a defined scope or limit.
• Basic usage: It describes repainting a wooden window frame white.
  • 古い窓の木の枠を白く塗り直した。

2. Common pitfalls and similar expressions

• Physical frame and limit
  • 窓の枠 is a physical window frame. 予算の枠 figuratively denotes the limits of the money available.