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English
ack-ack gun emplacement c. 1941
Etymology
From ack(“A”) + ack(“A”), RAF WWI signalese for AA(“anti-aircraft”). (In modern signalese it would be called alpha-alpha.)
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.
