Définitions
1.NounA very unpleasant or frightening dream. .mw-parser-output .defdate{font-size:smaller}"I had a nightmare that I tried to run but could neither move nor breathe."
2.NounAny bad, miserable, difficult or terrifying situation or experience that arouses anxiety, terror, agony or great displeasure."Cleaning up after identity theft can be a nightmare of phone calls and letters."
3.NounA demon or monster, thought to plague people while they slept and cause a feeling of suffocation and terror during sleep.
4.NounA feeling of extreme anxiety or suffocation experienced during sleep; sleep paralysis.
5.VerbTo experience a nightmare.
6.VerbTo imagine (someone or something) as in a nightmare.
7.VerbTo trouble (someone or something), as by a nightmare.