one-track

UK: /ˌwʌnˈtræk/ US: (wun′trak′)

WordReference Random House Learner's Dictionary of American English © 2026

ˈone-ˌtrack,  adj. [before a noun]

1. unable or unwilling to deal or work with more than one idea, subject, etc., at one time:
   a one-track mind.

WordReference Random House Unabridged Dictionary of American English © 2026

one-track  (wun′trak′), adj. 

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.

• 1925–30

Collins Concise English Dictionary © HarperCollins Publishers::

one-track adjective

1. obsessed with one idea, subject, etc
2. having or consisting of a single track