Frankenstein’s monster - definition and synonyms

noun [countable] 

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/ˌfræŋkənstaɪnz ˈmɒnstə(r)/
singularFrankenstein’s monster
pluralFrankenstein’s monsters
  1. an invention that cannot be controlled by the person who created it, especially when it causes harm that was not intended
Word story
From a character in Frankenstein, a 19th-century novel by the British writer Mary Shelley.