That new viral video is just a nine-day wonder.
nine-day wonder
idiomSomething that generates interest for a limited time and is then abandoned.
Origin
first recorded 14th c.From nine + day + wonder (“something that causes amazement or awe”). References to a period of nine days or nights to describe the length of a short-lived fad date from as early as the 14th century; see, for instance, Troilus and Criseyde (c. 1380s) by the English poet Geoffrey Chaucer (c. 1340s – 1400; spelling modernized): “Ek [besides] wonder last but nine days never in town”.
The media obsessed over the new gadget for a week, but it proved to be a nine-day wonder.
While the politician's radical proposal initially captured the public imagination, it ultimately became a nine-day wonder, quickly forgotten as the next scandal emerged.
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gutless wonder
One who lacks guts or courage; a coward.
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no-hit wonder
A recording artist who proves to be commercially successful, or maintains a long career, without having any hit songs at all.
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one-hit wonder
A recording artist known for only one hit song, especially after failing at subsequent attempts at success.
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small wonder
An event or fact whose cause or rationale is not difficult to discern; an unsurprising occurrence.
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two-hit wonder
A recording artist known for only two hit songs.