Definition of rat run noun from the Oxford Advanced Learner's Dictionary

 

rat run

 noun
noun
BrE
 
; NAmE
 
(British English, informal) Motoring problems and accidents, Types of road
 
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a small road, especially one with houses on it, used by drivers during busy times when the main roads are full of traffic The road is a well-known rush-hour rat run. See related entries: Motoring problems and accidents, Types of road