WordNet
ack-ack gun
n. artillery designed to shoot upward at airplanes [syn: antiaircraft, antiaircraft gun, flak, flack, pom-pom, ack-ack]
Usage examples of "ack-ack gun".
Liftin' the barrel of a bleedin' ack-ack gun, that's 'ow I got it.
He mounts the podium, dives for a round of chalk, and starts hammering equations onto the blackboard like an ack-ack gun.
Another flash-bang following on its heels, and another, as though an ack-ack gun were going off beneath our feet.