temporary prosperity; brief flourishing
Refers to a period of success or popularity that is short-lived; often used with a sense of impermanence.
That shop's brief period of prosperity is already over.
After his temporary fame, he was quickly forgotten.
Compound of 一 (ひと, 'one') and 盛り (さかり, 'peak, prime'), literally 'one prime', suggesting a single, transient flourishing.