合う

1. Origins, structure, and basic meaning

• Structure: Spelling: 合う. Reading: あう. Core meaning: to fit; to suit.
• Basic usage: Representative examples: この靴は私の足にぴったり合う / 青い壁には白い家具がよく合っている.

2. Common pitfalls and similar expressions

• Fit and suitability
  • A shoe fitting a foot is physical compatibility, while furniture suiting a wall color is visual harmony. In both senses, the standard or counterpart can be marked with に.