walking school bus
 n.— «Some parents have put some of those worries to rest by starting what’s called a “walking school bus.” It’s a group of students, led and monitored by parents, who walk to school *together.*» —“Walking school bus in Quincy” by Rajah Maples KHQA-TV (Quincy, Illinois) May 28, 2007. (source: Double-Tongued Dictionary)

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