flack/flæk/EtymologyFrom Middle English flack (“sod, turf”); see flag (sense 4).flack means A surname. Lexicurio rates it Rare gem — a strength score of 83 out of 100.nameA surname.verbTo flutter; palpitate.To hang loosely; flag.To beat by flapping.To publicise, to promote.“[..] he told funny stories about his early days in the theater district, flacking shows up and down the street, but Klara wasn’t listening.”nounA publicist, a publicity agent.“Edward Bernay, who was a consultant to the US Delegation to the Versailles Peace Conference which terminated the first World War (and who finally wound up as a flack for the United Fruit Company in Latin America), believed that propaganda and its covert marketing could effectively alter the will of the American public.”