Ack-ack Definition

ăkăk

noun

An antiaircraft gun.

American Heritage

An antiaircraft gun or its fire.

Webster's New World

Antiaircraft fire.

American Heritage

The army fired upon us with ack-ack.

Ack-acks were set up in the square.

Wiktionary

(uncountable) Antiaircraft fire.

The bomber flew through heavy ack-ack.

Wiktionary

Synonyms:

adjective

Of or relating to antiaircraft warfare.

Wiktionary

Other Word Forms of Ack-ack

Singular:

ack-ack

Plural:

ack-acks

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

From Wiktionary
British telephone code for AA abbreviation for antiaircraft

From American Heritage Dictionary of the English Language, 5th Edition