variants:
or less commonly flack
plural flak also flack
Definition of flak
1
: antiaircraft guns
2
: the bursting shells fired from flak
3
: criticism, opposition
She has taken a good deal of flak for espousing that view.— E. J. Kahn, Jr. When I was a restaurant bar manager I sometimes found myself taking flak from my customers for our high prices …— Rob Hill
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Merriam-Webster unabridged
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Time Traveler for flak
The first known use of flak was in 1938
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