will-o’-the-wisp
noun /ˌwɪl ə ðə ˈwɪsp/
/ˌwɪl ə ðə ˈwɪsp/
[usually singular]- a thing that is impossible to obtain; a person that you cannot depend on
难以捉摸的人(或事物);镜花水月;虚无之物 - a blue light that is sometimes seen at night on soft, wet ground and is caused by natural gases burning
磷火;鬼火
词源early 17th cent.: originally as Will with the wisp, the sense of wisp being ‘handful of (lighted) hay’.