窓枠

1. Origins, structure, and basic meaning

• Structure: 窓枠 (まどわく) is a compound noun for the frame surrounding and supporting a window.
• Basic usage: 木製の窓枠を塗り直す makes the whole wooden frame the repainting object, while 窓枠の一部が腐る makes a rain-damaged portion the subject.

2. Common pitfalls and similar expressions

• Whole frame and partial damage
  • 窓枠の一部 says only a portion rotted; it does not extend the damage to the whole frame or the glass. This differs from the full-frame repainting scope in the first example.