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an·ti·air·craft / ˌantēˈerˌkraft; ˌantī-/ (also an·ti-air·craft) (abbr.:AA) • adj. (esp. of a gun or missile) used to attack enemy aircraft.
ack-ack / ˈak ˌak/ informal • n. an antiaircraft gun. ∎ antiaircraft gunfire.
ack-ack (ˈækˌæk) anti-aircraft (World War I phonetic alphabet for AA)
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