ack-ack
ack-ack definition
ack·-ack (ak′ak′)
noun
Slang an antiaircraft gun or its fire
Etymology: echoic; prob. expansion of abbrev. A.A., antiaircraft artillery
Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.
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