(military slang) artillery.
The army fired upon us with ack-ack.
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(military slang, uncountable) fire.
Ack-acks were set up in the square.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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Browse all slang words starting with A.