ack-ack

  1. (countable, slang, uncountable) Antiaircraft artillery.
  2. (slang, uncountable) Antiaircraft fire.

Etymology

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

antiaircraft gun

ack-ack gun

antiaircraft artillery

luchtafweergeschut

artillerie anti-aérienne

luchtdoelgeschut

arma antiaerea

ack-ack-ack

artillería antiaérea

uçaksavar ateşi

cannone antiaereo

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