noun
noun, mainly US
1: A publicity agent. (1946 —) .
C. Drummond They were booked to do ten matches in Mexico City; Bull, their flack, had lined up the opposition (1968
). verb N Amer
2: intr. To act as a publicity agent (
for); hence, to disseminate favourable publicity, etc.; to proselytize. (1966 —) .
Forbes You could cite the country's poverty....You might even fault the tourism board for not flacking hard enough (1984
).
3: trans. To promote or speak in favour of; to disseminate (information, etc.) to this end. (1975 —) .
[Origin unknown.]