Longman Dictionary of Contemporary English homepage

will o' the wisp

 noun
     
Related topics: Nature
will o' the wisp [countable usually singular]
1 someone that you can never completely depend on, or something that you can never achieve
2DN a blue moving light caused by natural gases, that can be seen over wet ground at night
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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