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sleeper
/ˈsliːpər/ noun [C] (also sleeper hit) MARKETINGDefinition
› a product, film, book, etc. that becomes a sudden success, after a period of not being successful at all: The movie cost only $400,000 to make, and then blew up into a $39 million sleeper. Her book has been the big sleeper hit of the literary scene.
(Definition of sleeper noun from the Cambridge Business English Dictionary
© Cambridge University Press)
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