ack-ack

noun
\ˈak-ˌak \

Definition of ack-ack 

: an antiaircraft gun also : antiaircraft fire

First Known Use of ack-ack

1917, in the meaning defined above

History and Etymology for ack-ack

British signalmen's telephone pronunciation of AA, abbreviation of antiaircraft entry 1

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Time Traveler for ack-ack

The first known use of ack-ack was in 1917

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