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A mindset or line of thinking that is fixated upon or preoccupied by a particular topic. Jerry, you have such a one-track mind—not everything has to do with sex. My sister has a one-track mind, only thinking about how something can further her career.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
Fig. a mind that thinks entirely or almost entirely about one subject. Adolescent boys often have one-track minds. All they're interested in is the opposite sex. Bob has a one-track mind. He can only talk about football.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
A mind limited to only one line of thought or action, as in All you think about is sex-you 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 © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
n. a (person’s) mind obsessed with only one thing. When it comes to food, Tom has a one-track mind.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.