American Heritage Dictionary
(2)
Century Dictionary
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
Using proximity fuzes, British ack-ack gunners (many of them women) learned how to shoot down the 400 mph V-1s; nothing could stop the supersonic V-2s.— Citizendium, the Citizens' Compendium - Recent changes [en]
Staring at those roaring ack-ack guns with deadbeat of hearts— Bloggers.Pakistan
This is the one with the line about the "heart attack-ack-ack" where he attack-ack-acks people who work two jobs so they can "trade in their Chevy for a Cadillac" - ack-ack, something B.J. would never do.— Expecting Rain
We urge caution around pole dancers, and those with enhanced chests, lest the nipples peel back and strafe the club with ack-ack fire …— Anorak News
Now look at the videos online of all the ack-ack fire over Colombo that night.— Kottu

American Heritage Dictionary (1)
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