flak

Definitions

General English

Media Studies

  • noun criticism of something broadcast, received as a ‘storm’ of complaints, letters, phone calls etc.

Military

Slang

  • noun criticism, antagonism, aggression, trouble. The terms Flugabwehrkanone and Fliegerabwehrkanone, given to German World War II anti-aircraft guns, provided this acronym which was adopted as an English colloquialism. It is now sometimes spelt flack.
http://www.dictionarycentral.com/definition/flak.html