| Idiom | One-Track Mind |
|---|---|
| Example | Paul has a one-track mind. All he ever thinks about is football, football, football. |
| Meaning | always thinking about only one subject |
| Origin | Most railroads have at least two tracks so trains can go in different directions without crashing into one another. However, on a single-track railroad line, train traffic can move in only one direction at a time. |
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