川底

1. Origins, structure, and basic meaning

• Structure: 川底 is read as かわぞこ and means “riverbed”.
• Basic usage: It denotes stones visible on a clear riverbed and sand accumulated there after heavy rain.

2. Common pitfalls and similar expressions

• 川底の石 / 川底に砂がたまる
  • Use 川底の石 for objects on the bed and 川底に砂がたまる for deposition there.