|Main Entry:||one-track mind|
|Part of Speech:||n|
|Definition:||a focus on one issue or topic, to the exclusion of all else; an obsession with one thing|
|Example:||She just has a one-track mind, wanting to move on.|
|Etymology:||1938; fr. railways|
A mind limited to only one line of thought or action, as in All you think about is sexyou 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.