Simple Definition of flak
: exploding shells that are shot at enemy aircraft from guns on the ground
: harsh criticism
Examples of flak in a sentence
He caught heavy flak for his decision to oppose the new school.
He took a lot of flak from the other kids for his unusual appearance.
Variants of flak
Origin and Etymology of flak
German, from Fliegerabwehrkanonen, from Flieger flyer + Abwehr defense + Kanonen cannons
First Known Use: 1938
Seen and Heard
What made you want to look up flak? Please tell us where you read or heard it (including the quote, if possible).