noun
inevitable decline; certain decay
Archaic term for the idea that decline or collapse is unavoidable. Rarely used in modern Japanese outside of historical or literary contexts.
「盛者必衰」ということわざの一部として「必衰」が使われる。
The word 必衰 is used as part of the proverb 盛者必衰 (jōsha hissui), meaning 'the prosperous must decline.'