nightmare

名词 nightmare:

1. a situation resembling a terrifying dream
   同义词：incubus
2. a terrifying or deeply upsetting dream

1. The nightmare gave her the creeps.
   那场恶梦使她不寒而栗。
2. I had a nightmare and cried out in horror.
   我做了一个恶梦，惊恐地大叫。
3. Driving during the blizzard was a nightmare.
   在暴风雪中开车真吓人。
4. I have nightmares about falling off a cliff.
   我常做恶梦梦见从悬崖上摔下来。

night.mare

n.（名词）
A dream arousing feelings of intense fear, horror, and distress.
恶梦：使人恐惧、害怕和痛苦的梦
An event or experience that is intensely distressing.
使人极其痛苦的事情或经历
A demon or spirit once thought to plague sleeping people.
梦魔：被认为折磨睡觉的人的魔鬼或灵魂

来源：
Middle English [a female demon that afflicts sleeping people]
中古英语 [折磨睡着的人的女妖精]
night [night] * see night
night [夜晚] *参见 night
mare [goblin] from Old English * see mer-
mare [妖怪] 源自 古英语 *参见 mer-

【引伸】
night.mar.ish
adj.（形容词）
night.mar.ishly
adv.（副词）
night.mar.ishness
n.（名词）