flak
Concise Oxford English Dictionary © 2008 Oxford University Press:
flak /flak/ (also flack)
▶noun
- 1 anti-aircraft fire.
- 2 strong criticism.
– origin 1930s: from Ger., abbrev. of Fliegerabwehrkanone, lit. ‘aviator-defence gun’.
'flak' also found in these Oxford entries:

