Meaning of “rat run” in the English Dictionary

british dictionary

"rat run" in British English

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rat runnoun [ C ]

uk /ˈræt ˌrʌn/ us /ˈræt ˌrʌn/ UK

a small road that is used by a lot of drivers who are trying to avoid traffic on larger roads:

The road through our village has become a rat run for commuters trying to avoid delays on the A14.

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