Definition of one-track mind noun from the Oxford Advanced Learner's Dictionary

 

one-track mind

 noun
noun
BrE
 
; NAmE
 
[usually singular]
 
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if somebody has a one-track mind, they can only think about one subject (often used to refer to somebody thinking about sex) All he ever talks about is football. He’s got a one-track mind.
See the Oxford Advanced American Dictionary entry: one-track mind