nine days' wonder
Something that generates interest for only a short amount of time. The musician feared becoming a nine days' wonder, forgotten long before he ever achieved success in his career.
nine days' wonder
Fig. something that is of interest to people only for a short time. Don't worry about the story about you in the newspaper. It'll be a nine days' wonder and then people will forget. The elopement of Bob and Anne was a nine days' wonder. Now people never mention it.
a nine days' wonder
something that attracts enthusiastic interest for a short while but is then ignored or forgotten.a ˌnine days’ ˈwonder
a person or thing that attracts a lot of attention, but only for a short time: The satellite that landed in their garden made the family a bit of a nine days’ wonder, but no one remembers their name now.