one-track mind

US /ˈwʌnˌtræk ˈmaɪnd/
UK /ˈwʌnˌtræk ˈmaɪnd/
"one-track mind" picture
1.

mente obsesiva, monomanía

a mind that thinks about one particular thing and nothing else

:
He's got a one-track mind when it comes to cars.
Tiene una mente obsesiva cuando se trata de coches.
All she talks about is her new project; she has a real one-track mind.
Todo lo que habla es de su nuevo proyecto; tiene una verdadera mente obsesiva.