active shooter

== English == === Etymology === The sense “individual engaged in a shooting spree” was popularized in the wake of the Columbine High School massacre (1999). === Pronunciation === (US) IPA(key): /ˌæk.tɪv ˈʃuːtɚ/ === Noun === active shooter (plural active shooters) (US, military, law enforcement) A person actively engaged in a shooting spree. [from ca. 2000] Used other than figuratively or idiomatically: see active,‎ shooter. ==== See also ==== mass shooting