English

Definition of pipe dream noun from the Oxford Advanced Learner's Dictionary

 

pipe dream

 noun
noun
BrE BrE//ˈpaɪp driːm//
 
; NAmE NAmE//ˈpaɪp driːm//
 
 
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a hope or plan that is impossible to achieve or not practical Word Originlate 19th cent.: referring to a dream experienced when smoking an opium pipe.
See the Oxford Advanced American Dictionary entry: pipe dream