rapids

1. Origins, structure, and basic meaning

• Structure: 瀬 has 19 strokes and appears in words for shallow water or a critical point.
• Basic usage: 浅瀬 is read あさせ, and 瀬戸際 is read せとぎわ.

2. Common pitfalls and similar expressions

• Shallow water and a critical point
  • 川の浅瀬 means the river shallows.
  • 一球で勝敗が決まる瀬戸際 means a critical point where one pitch decides the outcome.