having only one track.
unable or unwilling to cope with more than one idea, action, etc., at a time; narrow: a one-track mind.

Origin of one-track

First recorded in 1925–30 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for one-track

Historical Examples of one-track

  • They are like a one-track railroad that has been congested with traffic.

    Humanly Speaking

    Samuel McChord Crothers

  • We parted with mutual benedictions, and John Maxwell and I walked away, toward the one-track road leading to the old mansion.

    The Telenizer

    Don Thompson

  • I must have journeyed on at least three small, one-track railroads after leaving the Pullman at some junction or other.

  • Once his one-track mind got to functioning on a certain objective it seldom digressed.

  • "Thank God that thing had a one-track mind, and was concentrating on the spider," said Jim, with a rather humorless laugh.

British Dictionary definitions for one-track



informal obsessed with one idea, subject, etc
having or consisting of a single track
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012