English version

will o' the wisp

From Longman Dictionary of Contemporary English
Related topics: Nature
will o' the wispˌwill o' the ˈwisp noun [countable usually singular]  1 DEPEND ON/RELY ONsomeone that you can never completely depend on, or something that you can never achieve2 DNa blue moving light caused by natural gases, that can be seen over wet ground at night
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