激減

1. Origins, structure, and basic meaning

• Structure: 激減 is read げきげん and means a sharp, substantial decline in number or quantity.
• Basic usage: It is used for fewer people using boats after a road opens or a harvest dropping substantially because of insufficient rain.

2. Common pitfalls and similar expressions

• Stronger wording than 減少
  • 減少(げんしょう) broadly refers to a decrease in number or quantity. 激減 emphasizes the large scale or sharpness of that decrease.