Slang an antiaircraft gun or its fire
Origin of ack-ackechoic; probably expansion of abbreviation, abbreviated A.A., antiaircraft artillery
- An antiaircraft gun.
- Antiaircraft fire.
Origin of ack-ackBritish telephone code for AA abbreviation for antiaircraft
(countable and uncountable, plural ack-acks)
- Of or relating to antiaircraft warfare.