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Ack-ack

noun, slang

Definitions

Noun
  1. 1
    Antiaircraft artillery. countable, slang, uncountable

    "The army fired upon us with ack-ack."

  2. 2
    artillery designed to shoot upward at airplanes wordnet
  3. 3
    Antiaircraft fire. slang, uncountable

    "The bomber flew through heavy ack-ack."

Etymology

From ack (“A”) + ack (“A”), RAF WWI signalese for AA (“anti-aircraft”). (In modern signalese it would be called alpha-alpha.)

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