Meaning of “tunnel vision” in the English Dictionary

"tunnel vision" in British English

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tunnel visionnoun [ U ]

uk /ˌtʌn.əl ˈvɪʒ.ən/ us /ˌtʌn.əl ˈvɪʒ.ən/

(Definition of “tunnel vision” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)