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)
Further reading
If you speak a second or third language, you may remember the first time you dreamed in that new tongue. But does this milestone mean you’re actually fluent? And a couple’s dispute over the word regret: Say you wish you’d been able...