a nine-day wonder

a nine/one/seven-day wonder

someone or something that causes interest or excitement for a short period but is then quickly forgotten His music was derided by an older generation convinced that he was a nine-day wonder.

Common Names:

Name	Pronounced	Usage
Darcy	DAHR-see	English
Hersh	-	Yiddish
Early	['ə:li]
Silvia	SEEL-vyah (Italian), SEEL-byah (Spanish)	Italian, Spanish, Portuguese, Romanian, Slovak, English, German, Late Roman, Roman Mythology
Xavi	-	Catalan
Miriam	MIR-ee-əm (English)	Hebrew, English, German, Biblical, Biblical Hebrew