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nightmare

['nait me..(r)] = /ˈnaɪtmeəʳ/
pronunciation help
  1. You are having a nightmare when you sleep in the night and you’re having a bad dream (for example, when you are dreaming that someone is trying to kill you). If a situation is very bad, you can also say it is a nightmare.
    My neighbor must have terrible nightmares. I can hear him screaming every night.
    What a nightmare. First somebody stole my car, and now I lost the keys to my apartment.
    The book described the nightmare of World War II.