one-track mind

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An expression referring to a way of thinking that is very focused, or even obsessed with, one thing in particular. The term one-track probably has its origin in the image of a train moving on a straight track in one direction. Like that train, the one-track mind will be directing all its energy toward a specific subject or purpose without considering other options.

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"One track mind, March 21, 2008" by ☻☺ is licensed under CC BY-SA.

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