名詞 nightmare:

1. a situation resembling a terrifying dream
   同義詞：incubus
2. a terrifying or deeply upsetting dream

1. The nightmare gave her the creeps.
   那場(chǎng)惡夢(mèng)使她不寒而栗。
2. I had a nightmare and cried out in horror.
   我做了一個(gè)惡夢(mèng)，驚恐地大叫。
3. Driving during the blizzard was a nightmare.
   在暴風(fēng)雪中開(kāi)車真嚇人。
4. I have nightmares about falling off a cliff.
   我常做惡夢(mèng)夢(mèng)見(jiàn)從懸崖上摔下來(lái)。

night.mare

n.（名詞）
A dream arousing feelings of intense fear, horror, and distress.
惡夢(mèng)：使人恐懼、害怕和痛苦的夢(mèng)
An event or experience that is intensely distressing.
使人極其痛苦的事情或經(jīng)歷
A demon or spirit once thought to plague sleeping people.
夢(mèng)魔：被認(rèn)為折磨睡覺(jué)的人的魔鬼或靈魂

來(lái)源：
Middle English [a female demon that afflicts sleeping people]
中古英語(yǔ) [折磨睡著的人的女妖精]
night [night] * see night
night [夜晚] *參見(jiàn) night
mare [goblin] from Old English * see mer-
mare [妖怪] 源自 古英語(yǔ) *參見(jiàn) mer-

【引伸】
night.mar.ish
adj.（形容詞）
night.mar.ishly
adv.（副詞）
night.mar.ishness
n.（名詞）