one-track mind
US /ˈwʌnˌtræk ˈmaɪnd/
UK /ˈwʌnˌtræk ˈmaɪnd/

1.
fikiran satu hala, pemikiran sempit
a mind that thinks about one particular thing and nothing else
:
•
He's got a one-track mind when it comes to cars.
Dia mempunyai fikiran satu hala apabila bercakap tentang kereta.
•
All she talks about is her new project; she has a real one-track mind.
Semua yang dia bincangkan adalah projek barunya; dia benar-benar mempunyai fikiran satu hala.