What is the meaning of ack-ack gun?

Artillery designed to shoot upward at airplanes.
- synonyms: antiaircraft, antiaircraft gun, flak, flack, pom-pom, ack-ack

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APA	WordNet. (2010). ack-ack gun. Retrieved September 20, 2026, from http://smartdefine.org/ack-ack_gun/definitions/1254594
Chicago	WordNet. 2010. "ack-ack gun" http://smartdefine.org/ack-ack_gun/definitions/1254594 (accessed September 20, 2026).
Harvard	WordNet 2010, ack-ack gun, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/ack-ack_gun/definitions/1254594>.
MLA	WordNet. "ack-ack gun" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/ack-ack_gun/definitions/1254594>

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