[From the fantasies induced by smoking a pipe of opium.]
noun
A fantastic notion or vain hope, as in I'd love to have one home in the mountains and another at the seashore, but that's just a pipe dream. Alluding to the fantasies induced by smoking an opium pipe, this term has been used more loosely since the late 1800s.

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Dansk (Danish)
n. - ønskedrøm, luftkastel
Français (French)
n. - chimère
Español (Spanish)
n. - fantasía, esperanza exagerada
中文(简体)(Chinese (Simplified))
白日梦, 幻想
中文(繁體)(Chinese (Traditional))
白日夢, 幻想
한국어 (Korean)
n. - 허무한 공상, 걷잡을 수 없는 생각
עברית (Hebrew)
n. - תקווה או תוכנית דמיונית ובלתי-ניתנת להשגה
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