nightmare Meaning in the Cambridge English Dictionary
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Meaning of “nightmare” in the English Dictionary

"nightmare" in British English

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nightmarenoun [C]

uk   /ˈnaɪt.meər/  us   /-mer/
B1 a very ​upsetting or ​frighteningdream: a ​terrifying nightmare I shouldn't have ​watched that ​movie - it'll give me nightmares.B1 an ​extremelyunpleasantevent or ​experience or ​possibleevent or ​experience: The ​wholejourney was a nightmare - we ​lostourluggage and both ​flights were ​delayed. Being ​trappedunderwater is my worst nightmare.
More examples
nightmarish
adjective uk   /-meə.rɪʃ/  us   /-mer.ɪʃ/
a nightmarish ​trafficjam
nightmarishly
adverb uk   /-meə.rɪʃ.li/  us   /-mer.ɪʃ.li/
(Definition of nightmare from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"nightmare" in American English

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nightmarenoun [C]

 us   /ˈnɑɪtˌmeər/
a very ​upsetting or ​frighteningdream, or an ​extremelyunpleasantevent or ​experience
nightmarish
adjective  us   /ˈnɑɪtˌmer·ɪʃ, -ˌmær-/
a nightmarish ​trafficjam
(Definition of nightmare from the Cambridge Academic Content Dictionary © Cambridge University Press)
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