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will o’ the wisp - definition and synonyms

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noun [countable]     will o’ the wisp pronunciation in American English
/ˌwɪl əðə ˈwɪsp/
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singularwill o’ the wisp
pluralwill o’ the wisps
  1. 1
    literary something that is impossible to achieve
  2. 2
    literary someone who you cannot depend on
  3. 3
    a blue light caused by burning gases that you sometimes see at night over wet ground
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