Words & TermsWar, service and history
ack-ack
Anti-aircraft fire, guns or related signalling; historical service slang.
In a sentence
In this historical or contextual use, “ack-ack” means anti-aircraft fire, guns or related signalling; historical service slang.
Where it came from
The AIF/RAAF service-language stream directly attests ack-ack. It is broader military signal slang rather than an Australian coinage, but it is strongly documented in Australian wartime usage.
- Initial era
- 1900–1949
- Where used
- Australian military usage; historical