Meaning of nightmare in English | Powered by Free Dictionary API

noun

• A demon or monster, thought to plague people while they slept and cause a feeling of suffocation and terror during sleep.

• Sleep paralysis.

• A very bad or frightening dream.

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

• Any bad, miserable, difficult or terrifying situation or experience that arouses anxiety, terror, agony or great displeasure.

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