A nine days' wonder - Idioms by The Free Dictionary
a nine days' wonder
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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.