decline; waning fortunes; decay
Refers to a loss of power, influence, or prosperity, often used for nations, organizations, or individuals. Somewhat formal and literary.
その政党は退勢を挽回できなかった。
The political party could not recover from its decline.
It is not easy to turn around a company in decline.
没落 refers to a fall from prosperity or status, often with a sense of ruin. 退勢 focuses on the waning trend rather than the final collapse.
reversing a downward trend; restoring declining fortunes; recovering from a discouraging situation
Standard kanji spelling for 'decline' or 'waning fortunes'.
Rare variant using the non-jōyō kanji 頽; learners should use 退勢.
Compound of 退 (retreat, decline) and 勢 (power, force). The combination conveys the idea of power receding or waning.