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- 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.
- (uncountable) Antiaircraft fire.
- The bomber flew through heavy ack-ack.