Nightmare

//ˈnaɪt.mɛə// noun, verb

Definitions

Noun
  1. 1
    A very unpleasant or frightening dream.

    "I had a nightmare that I tried to run but could neither move nor breathe."

  2. 2
    a terrifying or deeply upsetting dream wordnet
  3. 3
    Any bad, miserable, difficult or terrifying situation or experience that arouses anxiety, terror, agony or great displeasure. figuratively

    "Cleaning up after identity theft can be a nightmare of phone calls and letters."

  4. 4
    a situation resembling a terrifying dream wordnet
  5. 5
    A demon or monster, thought to plague people while they slept and cause a feeling of suffocation and terror during sleep. archaic

    "It haunted me, however, more than once, like a night-mare."

Show 1 more definition
  1. 6
    A feeling of extreme anxiety or suffocation experienced during sleep; sleep paralysis. historical

    "The Night-mare generally ſeizes people ſleeping on their backs, and often begins with frightful dreams, which are ſoon ſucceeded by a difficult reſpiration, a violent oppreſſion on the breaſt, and a total privation of voluntary motion."

Verb
  1. 1
    To experience a nightmare. intransitive

    "Brother Fary of Omaha was nightmaring the rest of the night."

  2. 2
    To imagine (someone or something) as in a nightmare. transitive

    "She was the last person I’d expected to see, although I had not expected to see anyone at all. For a moment I thought it was a nightmare, and that I was nightmaring the whole thing."

  3. 3
    To trouble (someone or something), as by a nightmare. transitive

    "THe day is broke! Melpomene, be gone; / Hag of my Fancy, let me now alone: / Night-mare my ſoul no more; Go take thy flight / Where Traytors Ghoſts keep an eternal night; […]"

Etymology

Etymology 1

From Middle English nyghtmare, from Old English *nihtmare, equivalent to night + mare (“evil spirit believed to afflict a sleeping person”). Cognate with Scots nichtmare and nichtmeer, Dutch nachtmerrie, Middle Low German nachtmār, German Nachtmahr.

Etymology 2

From Middle English nyghtmare, from Old English *nihtmare, equivalent to night + mare (“evil spirit believed to afflict a sleeping person”). Cognate with Scots nichtmare and nichtmeer, Dutch nachtmerrie, Middle Low German nachtmār, German Nachtmahr.

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