土砂

1. Origins, structure, and basic meaning

• Structure: Written 土砂 and read どしゃ, it denotes earth and sand as loose material, often in construction or landslides.
• Basic usage: It is used for sediment washed down by rain or soil removed by excavation.

2. Common pitfalls and similar expressions

• Material rather than soil ecology
  • The focus is movable earth and sand, not soil as a living growing medium.