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one-track

American  
[wuhn-trak] / ˈwʌnˌtræk /

adjective

  1. having only one track.

  2. unable or unwilling to cope with more than one idea, action, etc., at a time; narrow.

    a one-track mind.


one-track British  

adjective

  1. informal obsessed with one idea, subject, etc

  2. 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

Etymology

Origin of one-track

First recorded in 1925–30

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