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ack-ack

Pronunciation: /akˈak/

Definition of ack-ack

noun

[mass noun, usually as modifier] Military, informal
  • anti-aircraft gunfire:a quick burst of ack-ack fire

Origin:

signallers' name for the letters AA; ack for A was replaced in military use by able in 1942

ack-ack in other Oxford dictionaries

Definition of ack-ack in the US English dictionary

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