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
Walenty	vah-LEN-ti	Polish
Mathilda	mə-TIL-də (English, Swedish)	English, Swedish, Ancient Germanic
Dias	['di:əs]
Bamforth	['bæmfəθ]
Hale (2)	HAYL	English
Jaqueline	JAK-ə-leen (English), JAK-ə-lin (English)	English (Modern), Portuguese (Brazilian)