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Noun: ack-ack  'ak,ak
Usage: informal
  1. Artillery designed to shoot upward at airplanes
    "The military base was protected by ack-ack guns";
    - antiaircraft, antiaircraft gun, flak, flack, pom-pom, ack-ack gun

Derived forms: ack-acks

Type of: gun

Encyclopedia: Ack-ack