flack /flæk/verb 4noun 1forms 3 verb4 •(US, Canada) 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. — 1997 •(dialect, UK) To hang loosely; flag. •(dialect, UK) To beat by flapping. •(no longer used) To flutter; palpitate. noun1 •(US, Canada) A publicist, a publicity agent.Thought you were flack," she said. "I'm not flack." "All right, P.R., a reporter, a novelist." — 1999 formsflacked · flacking · flacks