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English definition of “will-o'-the-wisp”

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will-o'-the-wisp

noun [C usually singular] uk   /ˌwɪl.ə.ðəˈwɪsp/ us  
something that is impossible to get or achieve: Full employment is the will-o'-the-wisp that politicians have been chasing for decades.
Translations of “will-o'-the-wisp”
in Chinese (Traditional) 虛幻的目標, 實現不了的事…
in Chinese (Simplified) 虚幻的目标, 实现不了的事…
(Definition of will-o'-the-wisp from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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