Idiom: One-Track Mind
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How to pronounce "one-track mind":
AU
That said to be possessed by someone who is obsessed with something or only able to think of one thing.
Example: "He has a one-track mind. All he ever talks about is trains and railroads."
Example Sentences
1
He has a one-track mind when it comes to playing video games.
2
She has a one-track mind about getting into medical school.
3
John has a one-track mind when it comes to making money.
4
Mary seems to have a one-track mind about losing weight.
5
My boss has a one-track mind when it comes to meeting deadlines.