Part of speech: noun

An oppressive condition in sleep, accompanied usually by bad dreams.

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Usage examples "nightmare":

  1. The memory of the faces of the crowds was to be a nightmare to him for years to come. - "A Son of the Hills", Harriet T. Comstock.
  2. A nightmare of the true nightmare of dreams. - "The Dark Forest", Hugh Walpole.
  3. The last weeks had been a nightmare. - "Comrade Yetta", Albert Edwards.