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2 definitions found
 for ack-ack
From The Collaborative International Dictionary of English v.0.48 :

  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]

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]

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