back-seat bullet
 n.— «However, unbuckled passengers aren’t the only threat to those in the front seat. “Anything that is not restrained or tied down will be thrown forward,” he said. “We’ve coined the phrase ‘back-seat bullets.’”» —“Review raises questions about drug studies on rats” by Paul Taylor Globe and Mail (Toronto, Canada) Dec. 29, 2006. (source: Double-Tongued Dictionary)

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