Definition of ack-ack in English:

ack-ack

Syllabification: ack-ack
Pronunciation: /ˈak ˌak
 
/
Military , • informal

noun

  • Antiaircraft gunfire: [as modifier]: a quick burst of ack-ack fire
    More example sentences
    • Keating and the officers and men went to sleep under clean skies, a sleep disturbed by the angry bark of ack-ack batteries and the drone of German planes looking for the beaches.
    • But the war grew wings and swept on and except for one Ju 88 who buzzed the field without biting yet drew 5000 rounds from the eager ack-ack boys.
    • The flight across the Channel was uneventful, but as soon as the formation crossed into German territory, ack-ack started opening up.

Origin

World War II: signalers' name for the letters AA.

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