Meaning of the word "one-track mind" in English

What does "one-track mind" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

one-track mind

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

Idiom

1.

a mind that thinks about one particular thing and nothing else

Example:
He's got a one-track mind when it comes to cars.
All she talks about is her new project; she has a real one-track mind.
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