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In some senses, ack-ack is marked as slang. Watch for register when choosing this word.
ack-ack
noun 2
Definitions
noun
1
Antiaircraft artillery.
The army fired upon us with ack-ack.
Ack-acks were set up in the square.
2
Antiaircraft fire.
The bomber flew through heavy ack-ack.
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