will-o'-the-wisp
US /ˌwɪl.oʊ.ðəˈwɪsp/
UK /ˌwɪl.oʊ.ðəˈwɪsp/

1.
api hantu
a faint, flickering light seen at night over marshy ground, believed to be caused by combustion of natural gases
:
•
The hikers reported seeing a mysterious will-o'-the-wisp in the swamp.
Para pejalan kaki melaporkan melihat api hantu misteri di paya.
•
Folklore often describes the will-o'-the-wisp as leading travelers astray.
Cerita rakyat sering menggambarkan api hantu sebagai penyesat pengembara.
2.
khayalan, sesuatu yang sukar dicapai
something that is impossible or difficult to achieve or catch
:
•
Chasing perfection can be a will-o'-the-wisp.
Mengejar kesempurnaan boleh menjadi sesuatu yang sukar dicapai.
•
His promise of a quick solution turned out to be a mere will-o'-the-wisp.
Janjinya untuk penyelesaian cepat ternyata hanya khayalan semata.