16/05/2019 8:12:00 16/05/2019 8:12:00 Defmean 16/05/2019 8:12:00 Ack-ack Ack-ack Ack-ack Share on What is Ack-ack?Ack-ack definition and meaning on Dictionary terms: noun Informal. (esp. during World War II)antiaircraft fire.antiaircraft arms.
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