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nightmare

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nightmare/ˈnaɪtˌmeɚ/noun
pluralnightmares
nightmare
/ˈnaɪtˌmeɚ/
noun
pluralnightmares
Learner's definition of NIGHTMARE  
[count]
: a dream that frightens a sleeping person: a very bad dream
: a very bad or frightening experience or situation

— nightmarish

/ˈnaɪtˌmerɪʃ/adjective,[more nightmarish; most nightmarish]
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