Definition from Wiktionary, the free dictionary
Jump to navigation Jump to search


ack-ack gun emplacement c. 1941


From ack (A) + ack (A), RAF WWI signalese for AA (anti-aircraft). (In modern signalese it would be called alpha-alpha.)


ack-ack (countable and uncountable, plural ack-acks)

  1. Antiaircraft artillery.
    The army fired upon us with ack-ack.
    Ack-acks were set up in the square.
    • 2015, Kate Atkinson, A God in Ruins, →ISBN, page 140:
      He had thought how down there on the ground, on enemy soil, there were probably hundreds of Ivys, nice Fräuleins with buck teeth and fiancés on U-boats, manning the German ack-ack, all united in an effort to kill him.
  2. (uncountable) Antiaircraft fire.
    The bomber flew through heavy ack-ack.


  • (anti-aircraft gun): AAA, AA