incubus

/ˈɪŋkjəbəs/
noun
  1. A male demon believed in folklore to lie on sleeping people, especially women, to have sexual intercourse with them.
    • Legends say that an incubus could be warded off by placing a Bible under the pillow.
    • In medieval stories, an incubus would visit sleepers and cause terrifying nightmares.
    • The old painting depicted an incubus crouching on the chest of a sleeping woman.
  2. A person or thing that oppresses, burdens, or causes great anxiety, like a nightmare.
    • The debt became an incubus that haunted him day and night.
    • For the small town, the abandoned factory was an incubus of unemployment and decay.
    • She felt the memory of the accident was an incubus she could not shake off.
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