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English definition of “nightmare”

nightmare

noun [C]
 
 
/ˈnaɪtmeər/
EXPERIENCE B1 a very unpleasant experience: The traffic can be a real nightmare after 4.30.Difficult situations and unpleasant experiencesAccidents and disasters
DREAM B1 a frightening dreamDreaming
(Definition of nightmare from the Cambridge Learners Dictionary © Cambridge University Press)
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