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Definition of ack-ack noun from the Oxford Advanced Learner's Dictionary

ack-ack

noun

/ˌæk ˈæk/

/ˌæk ˈæk/

[uncountable] (informal)

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the repeated firing of guns at aircraft
Word Originsignallers' name for the letters AA; ack for A was replaced in military use by able in 1942.

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