内枠

1. Origins, structure, and basic meaning

• Structure: 内枠 is read as うちわく and means an inner frame positioned inside an outer frame.
• Basic usage: It can be a damaged frame component that is replaced or the inside frame of a window that gathers dust.

2. Common pitfalls and similar expressions

• Contrasted with the outer frame
  • The 外枠 removed first and the damaged 内枠 replaced afterward are distinct parts. Example: 職人は外枠を外してから、傷んだ内枠を交換した。
• The inner part of a window
  • 窓の内枠 identifies the frame on the inner side of the window structure. Example: 窓の内枠に積もったほこりを細いブラシで払った。