At San Antonio the ack-ack reaction was formidable.    From Wordnik.com.  [CASTRO DENOUNCES U.S. AGRESSION] Reference

Janie with her clever hand on the ack-ack prototype.    From Wordnik.com.  [More Than Human]

We reinforced our ack-ack but they did not come back.    From Wordnik.com.  [CASTRO DENOUNCES U.S. AGRESSION] Reference

These are Soviet vintage 20 millimeter ack-ack (ph) guns.    From Wordnik.com.  [CNN Transcript Apr 2, 2003] Reference

Any Huns who came in low were popped off by the ack-ack boys.    From Wordnik.com.  [The HurricaneStory]

The ack-ack guns make so much noise you can't hear your own voice.    From Wordnik.com.  [The Diary Of A Young Girl]

"Can you tell whether they're limbering up any ack-ack around there?".    From Wordnik.com.  [Children of the Lens]

There was a whoosh and then a crump, and ack-ack guns started up off to the east.    From Wordnik.com.  [To Say Nothing of the Dog]

What they have is old 20 millimeter Soviet - vintage ack-ack guns, anti-aircraft guns.    From Wordnik.com.  [CNN Transcript Apr 6, 2003] Reference

After an hour of the deafening ack-ack of the engine, we arrived at the muddy coast of Moheshkhali.    From Wordnik.com.  [Johann Hari: A Journey Across the Ground Zero of Global Warming] Reference

The ack-ack stopped and then started up again with renewed effort, and the hum of the planes got louder.    From Wordnik.com.  [To Say Nothing of the Dog]

There was a loud hum that threatened to drown out the ack-ack guns, and the veils on the net began to lower.    From Wordnik.com.  [To Say Nothing of the Dog]

The All-Clear had started up again, and now it was accompanied by a steady, thumping throb, like ack-ack guns.    From Wordnik.com.  [To Say Nothing of the Dog]

They have come to call & we'll all go walking under the black sky's droning big bombers among the ratatat of ack-ack.    From Wordnik.com.  [languagehat.com: THINKING FULL WELL.] Reference

Staring at those roaring ack-ack guns with deadbeat of hearts.    From Wordnik.com.  [Bloggers.Pakistan] Reference

But still the boys in the British ack-ack unit said, Isn't it horrible?.    From Wordnik.com.  [The War in the Far East] Reference

Now look at the videos online of all the ack-ack fire over Colombo that night.    From Wordnik.com.  [Kottu] Reference

I do not know if there is any connection between this and the British term ack-ack.    From Wordnik.com.  [VERBATIM: The Language Quarterly Vol VIII No 1] Reference

"Ah! ack-ack", the German officer smiled through his eyes pretending he knew this American acronym all along.    From Wordnik.com.  [Above the Clouds at Thirty Below] Reference

In connection with ack-ack, one encounters much flak, and Mr. Baker suggests that its origin is an acronym of Flugzeugabwehrkanone.    From Wordnik.com.  [VERBATIM: The Language Quarterly Vol VIII No 1] Reference

"But if it's ack-ack, they've another guess coming.    From Wordnik.com.  [Tom Swift Jr And His Flying Lab]

Is this an ack-ack station or is it a museum?) "Hip!.    From Wordnik.com.  [More Than Human]

That’s ’cause no one likes you any more ack-ack, assuming anyone ever did.    From Wordnik.com.  [New Project Orion Takeoff | My[confined]Space] Reference

Of whatever ack-ack they could bring to bear on her crate during the few minutes she would have to use it.    From Wordnik.com.  [Children of the Lens]

We call the ack-ack thing barking.    From Wordnik.com.  [Creation From The Sickbed] Reference

We heard bombs and ack-ack.    From Wordnik.com.  [CASTRO DENOUNCES U.S. AGRESSION] Reference

We were angels with ack-ack proof wings.    From Wordnik.com.  [Above the Clouds at Thirty Below] Reference

9) 18 ... who, in angry dispute, throw ack-ack around.    From Wordnik.com.  [VERBATIM: The Language Quarterly Vol V No 1] Reference

Ja, ja, ack-ack!.    From Wordnik.com.  [Above the Clouds at Thirty Below] Reference

Most ack-ack I have ever seen ".    From Wordnik.com. Reference