one-track mind

Main Entry:  one-track mind
Part of Speech:  n
Definition:  a focus on one issue or topic, to the exclusion of all else; an obsession with one thing
Example:  She just has a one-track mind, wanting to move on.
Etymology:  1938; fr. railways's 21st Century Lexicon
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Slang Dictionary

one-track mind definition

  1. n.
    a (person's) mind obsessed with only one thing. : When it comes to food, Tom has a one-track mind.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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American Heritage
Idioms & Phrases

one-track mind

A mind limited to only one line of thought or action, as in All you think about is sexyou have a one-track mind. This expression, alluding to a train that runs only on one track or in one direction, was first recorded in 1928.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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