From WordNet (r) 3.0 (2006): ack-ack n 1: artillery designed to shoot upward at airplanes [syn: antiaircraft, antiaircraft gun, flak, flack, pom- pom, ack-ack, ack-ack gun]
ack-ack n 1: artillery designed to shoot upward at airplanes [syn: antiaircraft, antiaircraft gun, flak, flack, pom- pom, ack-ack, ack-ack gun]
