ack-ack - WordReference.com Dictionary of English

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ack-ack

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Concise Oxford English Dictionary © 2008 Oxford University Press:
ack-ack/akˈak/

▶noun Military, informal anti-aircraft gunfire or guns.

– origin First World War: former signallers' name for the letters AA.

'ack-ack' also found in these Oxford entries:

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