ACK-ACK


Meaning of ACK-ACK in English

/ ˌækˈæk; NAmE / noun

[ U ] ( informal ) the repeated firing of guns at aircraft

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WORD ORIGIN

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

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.