衰える

1. Origins, structure, and basic meaning

• Structure: 衰える is read おとろえる and means weakening in strength or vigor, or declining as an industry.
• Basic usage: It is used for shipbuilding gradually declining or physical strength weakening.

2. Common pitfalls and similar expressions

• Focus compared with 減る
  • 減る(へる) focuses on a reduction in number or quantity. 衰える describes a weakening of strength, vitality, or former prosperity.