a figment of someone's imagination

US /ə ˈfɪɡmənt əv ˈsʌmwʌnz ɪˌmædʒɪˈneɪʃən/
UK /ə ˈfɪɡmənt əv ˈsʌmwʌnz ɪˌmædʒɪˈneɪʃən/
"a figment of someone's imagination" picture
1.

rekaan imaginasi seseorang, khayalan semata

something that someone has imagined and that does not really exist

:
The monster under the bed was just a figment of his imagination.
Raksasa di bawah katil hanyalah rekaan imaginasinya.
Her fear of flying is not a figment of her imagination; it's a real phobia.
Ketakutannya terhadap penerbangan bukanlah rekaan imaginasinya; ia adalah fobia sebenar.