Definition from Wiktionary, the free dictionary
- increased traffic due to the number of parents taking or collecting their children to and from school by car.
2006 April 30, Cole Moreton, “The school run”, in The Independent:
- A billion trips are made on the school run every year and, between us, parents produce two million extra tons of the greenhouse gas carbon dioxide, a cause of global warming.
- a car trip to and from the school to transport a student.