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active shooter

[ak-tiv shoo-ter] /ˈæk tɪv ˈʃu tər/
noun
1.
a person who is presently using a gun to shoot people in a confined and populated area.
Origin of active shooter
1965-1970
First recorded in 1965-70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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