Definition of rat run in English:

rat run

Line breaks: rat run

Entry from British & World English dictionary

noun

British informal
A minor, typically residential street used by drivers during peak periods to avoid congestion on main roads: our road was used as a rat run between two main roads

Definition of rat run in:

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Word of the day neoteny
Pronunciation: nēˈätn-ē
noun
retention of juvenile features in the adult animal