One-track mind
noun
a focus on one issue or topic, to the exclusion of all else; an obsession with one thing
Examples
She just has a one-track mind, wanting to move on.
Word Origin
1938; fr. railways
noun phrase
A mind limited to or obsessed with a single idea, theme, etc (1927+)
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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