单词	active shooter
释义	active shooter noun plural active shooters : a person who is illegally using a firearm to kill or try to kill people especially in a public place : a person who is shooting at people Stunned shoppers and mall employees initially mistook the sound of glass breaking for gunshots, leading to false rumors of an active shooter. Caitlin Antonios active shooter drills Word History First Known Use 1999, in the meaning defined above
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