will-o'-the-wisp
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will–o'–the–wisp

noun \ˌwil-ə-thə-ˈwisp\

Definition of WILL-O'-THE-WISP

2
: a delusive or elusive goal
will–o'–the–wisp adjective

Origin of WILL-O'-THE-WISP

Will (nickname for William) + of + the + wisp
First Known Use: circa 1661

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