Meaning of “one-track mind” in the English Dictionary

british dictionary

(Definition of “one-track mind” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"one-track mind" in American English

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one-track mindnoun [ C ]

/ˈwʌnˌtræk ˈmɑɪnd/

someone's tendency to think about or be interested in a single subject

(Definition of “one-track mind” from the Cambridge Academic Content Dictionary © Cambridge University Press)