ack-ack

/ˌˈæk ˌˈæk/
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Definitions of ack-ack
  1. noun
    artillery designed to shoot upward at airplanes
    synonyms: ack-ack gun, antiaircraft, antiaircraft gun, flack, flak, pom-pom
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    types:
    Bofors gun
    an automatic double-barreled antiaircraft gun
    type of:
    gun
    a weapon that discharges a missile at high velocity (especially from a metal tube or barrel)
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