noun Informal. (esp. during World War II)
antiaircraft fire.
antiaircraft arms.
Also, Ack-Ack.

1935–40; for A.A. (abbreviation of a(nti) a(ircraft)) as said by British signalmen referring to sense 2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ack-ack (ˈækˌæk)
1.  a.  anti-aircraft fire
 b.  (as modifier): ack-ack guns
2.  anti-aircraft arms
[C20: British army World War I phonetic alphabet for AA, abbreviation of anti-aircraft]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1939, representing A.A., the military abbreviation for anti-aircraft (see ack).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But we're shooting at them with rifles, and there's an ack-ack unit near there.
The ack-ack--German ack-ack was so heavy that the bombardier couldn't--couldn't make the--you know, his run.
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