Longman Dictionary of Contemporary English homepage

Topic: NATURE

will o' the wisp

 noun
     
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 of will o' the wisp from the Longman Dictionary of Contemporary English within
the topic NATURE
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