Etymology
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flack (n.)

"publicity or press agent," 1945, also by that year as a verb, said to have been coined at show biz magazine Variety (but the first attested use is not in Variety) and supposedly from name of Gene Flack, a movie agent, but influenced by flak. There was a Gene Flack who was an advertising executive in the U.S. during the 1940s, but he seems to have sold principally biscuits, not movies.

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Definitions of flack

flack (n.)
a slick spokesperson who can turn any criticism to the advantage of their employer;
Synonyms: flak catcher / flak / flack catcher
flack (n.)
intense adverse criticism;
Synonyms: fire / attack / flak / blast
flack (n.)
artillery designed to shoot upward at airplanes;
Synonyms: antiaircraft / antiaircraft gun / flak / pom-pom / ack-ack / ack-ack gun
From wordnet.princeton.edu