WILL-O' THE-WISP


Meaning of WILL-O' THE-WISP in English

/ ˌwɪl ə ðə ˈwɪsp; NAmE / noun [ usually sing. ]

1.

a thing that is impossible to obtain; a person that you cannot depend on

2.

a blue light that is sometimes seen at night on soft wet ground and is caused by natural gases burning

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.