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ack-ack

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Noun ack-ack has 1 sense
  1. antiaircraft, antiaircraft gun, flak, flack, pom-pom, ack-ack, ack-ack gun - artillery designed to shoot upward at airplanes
    --1 is a kind of gun
    --1 has parts: predictor
    --1 has particulars: Bofors gun
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