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ack-ack

1939, representing A.A., the military abbreviation for anti-aircraft (see ack).

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Definitions of ack-ack from WordNet

ack-ack (n.)
artillery designed to shoot upward at airplanes;
Synonyms: antiaircraft / antiaircraft gun / flak / flack / pom-pom / ack-ack gun
From wordnet.princeton.edu