one-track mind
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.
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Words nearby one-track mind
one that loved not wisely but too well, One Thousand Guineas, one-time, one-to-one, one-track, one-track mind, one-trick pony, Onetti, one-two, one up, one-upmanship
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.