Found 2 items, similar to ack-ack.
English → English (WordNet) Definition: ack-ack ack-ack n : artillery designed to shoot upward at airplanes [syn: antiaircraft, antiaircraft gun, flak, flack, pom-pom, ack-ack gun ]
English → English (gcide) Definition: ack-ack ack-ack \ack-ack\ n. [from AA, meaning antiaircraft pronounced ack-ack by British signalmen.] (Mil.) Artillery designed to shoot upward at airplanes; antiaircraft artillery. Syn: antiaircraft, antiaircraft gun, flak, pompom, pom-pom, ack-ack gun [WordNet 1.5 +PJC]