join · fit

1. Origins, structure, and basic meaning

• Structure: 合 expresses joining or fitting together; its on-reading is ごう.
• Basic usage: The verb 合う, read あう, describes fitting in size or going well together. 試合, meaning a match or game, is read しあい.

2. Common pitfalls and similar expressions

• Fit and harmony
  • 足にぴったり合う means that shoes fit the feet perfectly.
  • When furniture よく合っている with a wall color, the point is harmony in color or style rather than size.