sleeper - definition and synonyms

noun [countable] 

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/ˈsliːpə(r)/
singularsleeper
pluralsleepers
  1. 1
    someone who is sleeping
  2. 4
    British a ring that you wear in your ear to prevent the hole from closing
     Synonyms and related words
  3. 5
    mainly American a film or a book that becomes very popular although it was not expected to